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cannot run the model outside modelbuilder using parameters

Question asked by oysterboy on Dec 4, 2011
i used a if-then-else logic script inside my model, it's to check if there's a field called: area_nb in the input table, if yes, calculate field, if no, add field then calculate field.
in the modelbuilder window, the model ran perfect well, just as i want. but when i use the parameter outside the model, it poped out a alert said area_nb already exist. it looks like the part just didn't work if I use the parameter.
I don't know why this happened. does anyone know why?

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