Makes error message less misleading and points to github for help. Issue #2692

[dstango]

Small changes to some error messages, that might help users not to search in the wrong place for the cause of an issue.

[TimvdLippe]

Nice!

[codecov-commenter]

Codecov Report

Merging #2693 (2bdc29c) into main (70e16dc) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #2693   +/-   ##
=========================================
  Coverage     86.27%   86.27%           
  Complexity     2777     2777           
=========================================
  Files           315      315           
  Lines          8335     8335           
  Branches       1037     1037           
=========================================
  Hits           7191     7191           
  Misses          873      873           
  Partials        271      271           

Impacted Files	Coverage Δ
...ByteBuddyCrossClassLoaderSerializationSupport.java	69.76% <ø> (ø)
...on/bytebuddy/InlineDelegateByteBuddyMockMaker.java	68.06% <ø> (ø)
...creation/bytebuddy/SubclassByteBuddyMockMaker.java	71.62% <ø> (ø)
...va/org/mockito/internal/runners/RunnerFactory.java	78.94% <ø> (ø)

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