Upgrade 10.3.0 to 10.4.0 crashes during opening the app

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Upon opening my 10.3.0 app in MxStudioPro 10.4.0 and accepting Mendix to convert the app to 10.4.0, it runs in this error:   My app's marketplace modules are up-to-date and /userlib is cleaned from old jar-files.   Editted: It does have to do with the app's styling. Still to find out the exact cause.
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1 answers
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in some instances custom UI modules have a empty settings.json file. Since Mendix 10.4 this generates a NULL error and compiling is no longer working. The solution is to add some empty brackets in the settings.json, as it can't be empty:

{ }

Now their is an empty awnser instead of a NULL error and compiling is working again.

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