the Png multiplayer with c# demo is borked

[behroozbc]

Which demo project is affected:
PONG MULTIPLAYER WITH C#

OS/device including version:
Godot v4.1.1.stable.mono - Windows 10.0.22621 - Vulkan (Forward+) - dedicated GeForce RTX 2060 () - Intel(R) Core(TM) i9-10900 CPU @ 2.80GHz (20 Threads)

Issue description:
I want test the PONG MULTIPLAYER WITH C# demo however, I see alot of errors for running on v4.1.1.stable.mono.official [bd6af8e0e]

Severity	Code	Description	Project	File	Line	Suppression State
Error	CS1061	'ENetMultiplayerPeer' does not contain a definition for 'CompressionMode' and no accessible extension method 'CompressionMode' accepting a first argument of type 'ENetMultiplayerPeer' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Lobby.cs	138	Active
Error	CS0246	The type or namespace name 'RPCAttribute' could not be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	66	Active
Error	CS0246	The type or namespace name 'RPCAttribute' could not be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	84	Active
Error	CS0246	The type or namespace name 'RPCAttribute' could not be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	90	Active
Error	CS0246	The type or namespace name 'RPCAttribute' could not be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Paddle.cs	50	Active
Error	CS0246	The type or namespace name 'RPCAttribute' could not be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Pong.cs	43	Active
Error	CS0246	The type or namespace name 'RPC' could not be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	66	Active
Error	CS0246	The type or namespace name 'RPC' could not be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	84	Active
Error	CS0246	The type or namespace name 'RPC' could not be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	90	Active
Error	CS0246	The type or namespace name 'RPC' could not be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Paddle.cs	50	Active
Error	CS0246	The type or namespace name 'RPC' could not be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Pong.cs	43	Active
Error	CS0103	The name 'RpcUnreliable' does not exist in the current context	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Paddle.cs	35	Active
Error	CS0103	The name 'MultiplayerAPI' does not exist in the current context	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	66	Active
Error	CS0103	The name 'MultiplayerAPI' does not exist in the current context	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	84	Active
Error	CS0103	The name 'MultiplayerAPI' does not exist in the current context	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	90	Active
Error	CS0103	The name 'MultiplayerAPI' does not exist in the current context	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Pong.cs	43	Active
Error	CS1501	No overload for method 'Connect' takes 4 arguments	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Lobby.cs	44	Active
Error	CS1061	'Vector2' does not contain a definition for 'y' and no accessible extension method 'y' accepting a first argument of type 'Vector2' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	33	Active
Error	CS1061	'Vector2' does not contain a definition for 'y' and no accessible extension method 'y' accepting a first argument of type 'Vector2' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	33	Active
Error	CS1061	'Vector2' does not contain a definition for 'y' and no accessible extension method 'y' accepting a first argument of type 'Vector2' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	33	Active
Error	CS1061	'Vector2' does not contain a definition for 'y' and no accessible extension method 'y' accepting a first argument of type 'Vector2' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	33	Active
Error	CS1061	'Vector2' does not contain a definition for 'y' and no accessible extension method 'y' accepting a first argument of type 'Vector2' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	33	Active
Error	CS1061	'Vector2' does not contain a definition for 'y' and no accessible extension method 'y' accepting a first argument of type 'Vector2' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	35	Active
Error	CS1061	'Vector2' does not contain a definition for 'y' and no accessible extension method 'y' accepting a first argument of type 'Vector2' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	35	Active
Error	CS1061	'Vector2' does not contain a definition for 'y' and no accessible extension method 'y' accepting a first argument of type 'Vector2' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	80	Active
Error	CS1061	'Vector2' does not contain a definition for 'y' and no accessible extension method 'y' accepting a first argument of type 'Vector2' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Paddle.cs	16	Active
Error	CS1061	'Vector2' does not contain a definition for 'y' and no accessible extension method 'y' accepting a first argument of type 'Vector2' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Paddle.cs	47	Active
Error	CS1061	'Vector2' does not contain a definition for 'x' and no accessible extension method 'x' accepting a first argument of type 'Vector2' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	45	Active
Error	CS1061	'Vector2' does not contain a definition for 'x' and no accessible extension method 'x' accepting a first argument of type 'Vector2' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	57	Active
Error	CS1061	'Vector2' does not contain a definition for 'x' and no accessible extension method 'x' accepting a first argument of type 'Vector2' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	57	Active
Error	CS1061	'Vector2' does not contain a definition for 'x' and no accessible extension method 'x' accepting a first argument of type 'Vector2' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	72	Active
Error	CS1061	'Vector2' does not contain a definition for 'x' and no accessible extension method 'x' accepting a first argument of type 'Vector2' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	72	Active
Error	CS1061	'Vector2' does not contain a definition for 'x' and no accessible extension method 'x' accepting a first argument of type 'Vector2' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	76	Active
Error	CS1061	'Vector2' does not contain a definition for 'x' and no accessible extension method 'x' accepting a first argument of type 'Vector2' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	76	Active
Error	CS1061	'Vector2' does not contain a definition for 'x' and no accessible extension method 'x' accepting a first argument of type 'Vector2' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Paddle.cs	47	Active
Error	CS1061	'SceneTree' does not contain a definition for 'NetworkPeer' and no accessible extension method 'NetworkPeer' accepting a first argument of type 'SceneTree' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Lobby.cs	66	Active
Error	CS1061	'SceneTree' does not contain a definition for 'NetworkPeer' and no accessible extension method 'NetworkPeer' accepting a first argument of type 'SceneTree' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Lobby.cs	88	Active
Error	CS1061	'SceneTree' does not contain a definition for 'NetworkPeer' and no accessible extension method 'NetworkPeer' accepting a first argument of type 'SceneTree' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Lobby.cs	122	Active
Error	CS1061	'SceneTree' does not contain a definition for 'NetworkPeer' and no accessible extension method 'NetworkPeer' accepting a first argument of type 'SceneTree' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Lobby.cs	140	Active
Error	CS1061	'SceneTree' does not contain a definition for 'IsServer' and no accessible extension method 'IsServer' accepting a first argument of type 'SceneTree' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Lobby.cs	52	Active
Error	CS1061	'SceneTree' does not contain a definition for 'IsServer' and no accessible extension method 'IsServer' accepting a first argument of type 'SceneTree' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Pong.cs	31	Active
Error	CS1061	'SceneTree' does not contain a definition for 'GetUniqueId' and no accessible extension method 'GetUniqueId' accepting a first argument of type 'SceneTree' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Pong.cs	37	Active
Error	CS1061	'SceneTree' does not contain a definition for 'GetUniqueId' and no accessible extension method 'GetUniqueId' accepting a first argument of type 'SceneTree' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Pong.cs	40	Active
Error	CS1061	'SceneTree' does not contain a definition for 'GetPeers' and no accessible extension method 'GetPeers' accepting a first argument of type 'SceneTree' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Pong.cs	33	Active
Error	CS0115	'Paddle._Process(float)': no suitable method found to override	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Paddle.cs	19	Active
Error	CS0117	'ENetMultiplayerPeer' does not contain a definition for 'CompressionModeEnum'	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Lobby.cs	113	Active
Error	CS0117	'ENetMultiplayerPeer' does not contain a definition for 'CompressionModeEnum'	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Lobby.cs	138	Active
Error	CS1061	'ENetMultiplayerPeer' does not contain a definition for 'CompressionMode' and no accessible extension method 'CompressionMode' accepting a first argument of type 'ENetMultiplayerPeer' could be found (are you missing a using directive or an assembly reference?)	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Lobby.cs	113	Active
Error	CS0115	'Ball._Process(float)': no suitable method found to override	Pong Multiplayer with C#	E:\GAME\GODOT-DEMO-PROJECTS\MONO\MULTIPLAYER_PONG\logic\Ball.cs	20	Active

Screenshots of issue:

[Calinou]

Thanks for the report! Consolidating in #697 (all C# demos need to be updated for Godot 4).