IDL Problem Code 91 with alias illegal-index-type

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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 a variable is being indexed using the wrong data type.

For example, when you try access elements of an array using an object reference:

a = [1,2,3,4]
b = a[plot()]
;   ^^^^^^^^^ illegal-index-type

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

a = [1,2,3,4]
b = a[0:1]
;   ^^^^^^ OK!