Could not load file or assembly 'log4net, Version=1.2.10.0 Crystal report Error
If you install 32 bit crystal report runtime software in your machine then try this Open IIS Go to current server – > Application Pools Select the application pool your 32-bit application will run under Click Advanced setting or Application Pool Default Set Enable 32-bit Applications to True If you install 64 bit crystal report runtime software in your machine Conversely, if you've got the 64bit version installed, ensure Enable 32-bit Applications is set to False See this link from stackoverflow https://stackoverflow.com/questions/17291736/could-not-load-file-or-assembly-log4net-version-1-2-10-0-culture-neutral-pub