IDL Problem Code 99 with alias undefined-var

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Execution Error

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

This problem, using types and documentation, identifies when you a variable you are interacting with has not been defined.

Your mileage may vary with this problem code, depending on how complete the docs are for your routines.

Here is a reproduce case using a foreach loop on a variable that is not defined:

foreach val, var do print, val
;            ^^^ undefined variable

To fix, check for typos and try again:

var = [1,2,3,4]
foreach val, var do print, val
;            ^^^ OK!