IDL Problem Code `43` with alias `expected-comma`

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Execution Error

This is a fatal error that prevents IDL from compiling or running code

This problem catches when your IDL syntax isn't quite right and theres supposed to be a comma after a statement.

idl

pro myPro arg
  ;      ^ expected comma
  compile_opt idl2
  print, arg
end

To fix, add in the missing comma:

idl

pro myPro, arg
  compile_opt idl2
  print, arg
end

IDL Problem Code 43 with alias expected-comma ​