IDL Problem Code 90 with alias potential-type-incompatibility

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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 may have a fatal type incompatibility at runtime.

For example, when you try to add a number and an object together:

a = 1 + envi()
;   ^^^^^^^^^^ potential type incompatibility

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

e = envi()
a = 1