Version Affected: 19.07.01 Post Upgrade
After upgrade to 19.07.01 from IDP version 9.2. we are getting this error about castle.core.dll does not match the assembly reference.
There are two main ways this could happen
1. If the Filesync service is left running during an upgrade, the Primary overwrites the newly updated web.config from the upgrader with the old version from the primary.
2. Upgrading without blind copy which leaved the SecureAuth0 web.config with references to the new DLL but the old DLL is still in place
Using the VM snapshot, revert to the old version of IDP. Turn off File sync and start the upgrade process again.
Explanation- The error message is because of a mismatch between the version specified in the web.config and the actual DLL version
The Actual castle.core.dll file, you would find it is on 4.4.0 however the castle.core reference in the web.config is 4.1.x.
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