Could not load file or assembly 'ChilkatDotNet4' or one of its dependencies. An attempt was made to load a program with an incorrect format.

Common Error #1

The Chilkat .NET assembly is a mixed-mode assembly. It provides a managed API, but the inner core contains native code. A process must load the correct assembly at runtime. A 32-bit process must load the 32-bit ChilkatDotNet4.dll, and a 64-bit process must load the 64-bit ChilkatDotNet4.dll. When a process tries to load the incorrect format, the following error will occur:

Could not load file or assembly 'ChilkatDotNet4' or one of its dependencies. An attempt was made to load a program with an incorrect format.
See Incorrect Format for more information.



check application pool (32 bit enable or not)

check ChilkatDotNet4 version 9.3.1


Microsoft Visual C++ 2010 SP1 Redistributable 32 bit / 64 bit
Microsoft Visual C++ 2012 SP1 Redistributable 32 bit/ 64 bit