Classification module crash

[ulfboge]

Describe the bug
When I a trying to run a classification, and reach the upload of training points-stage (an EE-asset), I get the error page attached.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Add recipie'
2. Click on 'Classification'
3. Add Saved Sepal Recipe-image for classification
4. Move through each step and when the column to pick training data is chosen, a page with the text"We are terribly sorry, but something went wrong with SEPAL." pops up.

Expected behavior
Moving on with the classification and start running the analysis-

Screenshots
Not possible. But the text: "We are terribly sorry, but something went wrong with SEPAL.
This is of course very embarrassing for us, and frustrating for you. Please, reload the page and try again. If this keeps on happening, report this to the SEPAL team and we will try to fix this issue as quick as possible." pops up.