Could not load file or assembly 'Interop.QBFC8Lib' or one of its dependencies

I am using a quickbooks sdk that containst the QBFC8Lib dll everything works fine on my dev machine. when I publish to my live server I get the following error:

System.BadImageFormatException: Could not load file or assembly 'Interop.QBFC8Lib' or one of its    

enter code heredependencies. An attempt was made to load a program with an incorrect format

I h开发者_如何转开发ave the sdk installed on both my dev machine and the live machine. still getting this error

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You areexactly right. on the server I went to the application pool for this application and needed to set enable 32 bit applications to true. That did it. Thanks for your help