MPS - null icon error ...

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Hi MPS Team,

i get the error message

[1034931] ERROR - hlighter.LeftEditorHighlighter - null icon was returned by renderer:
jetbrains.mps.ide.java.platform.highlighters.OverridingMethodEditorMessage@4f5b9423

constantly in the java console where i started MPS. Guess it has something to do with my languages. How can i find the problem? No Erros no other hints are given ...

Any help appreciated ...
dan
I also get the error message

14:32:01 IllegalStateException: @NotNull method jetbrains/mps/ide/make/actions/TransientModelsWidget.getIcon must not return null: @NotNull method jetbrains/mps/ide/make/actions/TransientModelsWidget.getIcon must not return null
1

what can i do? MPS is hanging itself up ...