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Run Time Problems. The expression contains undefined function call MyUserFunction().


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An error with red message 'The expression contains undefined function call MyUserFunction().' occurs in the report.


There are three cases in which this error message occurs:

  • The function name is typed in manually in the Expression, without building the class library, and it does not exist yet.
  • Using the function with incorrect number/type of parameters. The passed fields must match the function signature.
  • The field specified in the function is null. Make sure such cases are handled in the user function.
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