Android Question Load Layout crashing

[Pintinho]

Hi
Getting desperate here... I don't know what has changed during the last few days.

Trying to test an App created last year, runs without any problems. Try to change the designer and it crashes when trying to upload the layout (java.lang.RuntimeException: java.lang.RuntimeException: unknown type).

Created new App (new project), with blank screen, no problems. Added a button through Designer, crashed with the same error when trying to load layout.

Working with Windows 10, B4A version 6.50. Didn't change the Manifest at all. Java JDK 8. Phone is working with Android 6.

What am I forgetting to do or set?
Thanks for any help you can give me!

 

[eps]

.NET or JDK needs updating?

Are you able to update or generate other projects in B4A?

 

[Erel]

.NET or JDK needs updating?

It is not related to .Net or Java.

It sounds like you are using the core libraries of an older version of B4A. I recommend you to reinstall B4A in a new folder.

 

[Pintinho]

Thanks, Erel!!
This was exactly the problem - using old libraries to change old app, I probably also replaced the core one!
Thanks again for your (extremelly) prompt help! Thanks, eps for your care!