An internal error occurred during: "Xtext validation". Cannot invoke "java.util.List.size()" because "issues" is null

Question

I followed the published steps but unfortunately, I find this error
shall I ignore it or it may affect the program performance

Answer 1

Xtext validation error can be caused by a number of different causes.

One of the most common causes, that the installed software component versions are not correct. Please check whether your JDK, Eclipse and Yakindu versions match the required versions.

Another reason might be, that your model contains syntax errors. Please check whether the syntax is correct everywhere, and whether the issue is present in the starting model as well.