i have problems with my gui

i created a gui but it gets errors, please help me

here is the error report

C:\Pylo\MCreator179\forge\build\sources\main\java\mod\mcreator\mcreator_runealtargui.java:106: error: cannot find symbol
                        mcreator_null.executeProcedure(dependencies);
                        ^
  symbol: variable mcreator_null
C:\Pylo\MCreator179\forge\build\sources\main\java\mod\mcreator\mcreator_runealtargui.java:128: error: cannot find symbol
                        mcreator_null.executeProcedure(dependencies);
                        ^
  symbol: variable mcreator_null
C:\Pylo\MCreator179\forge\build\sources\main\java\mod\mcreator\mcreator_runealtargui.java:150: error: cannot find symbol
                        mcreator_null.executeProcedure(dependencies);
                        ^
  symbol: variable mcreator_null
C:\Pylo\MCreator179\forge\build\sources\main\java\mod\mcreator\mcreator_runealtargui.java:172: error: cannot find symbol
                        mcreator_null.executeProcedure(dependencies);
                        ^
  symbol: variable mcreator_null
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
4 errors

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.