Android Question runtimepermission error for file write

[JayBesh]

I am changing File.DirDefaultExternal to GetSafeDirDefaultExternal, as stated in the RunTimePermissions tutorial and video.
Compiles fine, but get a run time error of NoClassDefFound:

java.lang.NoClassDefError: android.core.content.ContextCompat
at anywheresoftware.b4a.objects.RuntimePermissions.GetSafeDirDefaultExternal(RuntimePermissions.java:120)

I use all the code suggested in the video:
Private rp As RuntimePermissions
Private <folder name> As String
in Activity_Create
<folder name> = rp.GetSafeDirDefaultExternal("aaa bbb")

Suggestions please! Thanks in advance.

 

[JayBesh]

oops, first error line should say - java.lang.NoClassDefFoundError: android.core.content.ContextCompat

 

[Erel]

Such errors are related to misconfigured SDK.

Carefully follow these instructions and everything will work: https://www.b4x.com/b4a.html

 

[JayBesh]

OK, thanks. I have finally switched over to a new system (computer) and the problem disappears. Great!

 

[JayBesh]

Thanks, Erel. I guess you can delete this thread. OIder system should have followed instructions, but maybe it was just a bit older.