fix for wcf error - Could not load file or assembly 'someapplicationname' or one of its dependencies. An attempt was made to load a program with an incorrect format.

To resolve the error, follow the below steps

1.Type "inetmgr" in run
2.click on Application Pools
3.right click on the application pool where your application is pointed to and select Advanced Settings
4.Set Enable 32 bit applications to True