IDL Problem Code 102 with alias potential-var-use-before-def

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Execution Error

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

This problem is the same as var-use-before-def, but is reduced in severity because of a common block being present.

This problem identifies when you use a variable before it has been defined.

Here's an example:

print, myVar
;      ^^^^^ used before def
myVar = 42

To fix, re-order or re-write your code:

myVar = 42
print, myVar
;      ^^^^^ OK!

If you are encountering this error in a catch block, see Catch Blocks for some ways to can resolve the issue.