IDL Problem Code 86 with alias illegal-list-op

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Execution Error

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

This problem, using types, identifies when you are using lists in a way that is not allowed.

For example, when you try to add a list and hash together:

a = list() + hash()
;   ^^^^^^^^^^^^^^^ illegal list op

To fix, correct your statement or re-write your code:

a = list(hash())
;   ^^^^^^^^ OK!