IDL Problem Code 92 with alias potential-arr-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 two arrays are being operated on that have incompatible types.
For example, when you try add together an array of numbers with an array of objects:
idl
a = intarr(5) + objarr(5)
;   ^^^^^^^^^^^^^^^^^^^^^ potential type incompatibilityTo fix, correct your statement or re-write your code:
idl
a = intarr(5)
b = objarr(5)