Access violation

I work on a LCM Project and first I choose my rst files for earlier and later landcover image. Afterwards as soon as I hit the continue button, I receive a msg 'Access violation at adress 400068D4 in module rtl60.bpl. Read of adress 0000000E1.

Why do I receive it?

ps: I imported the img files from erdas and they visually look completely compatible in IDRISI . 


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