The error message 'could not load type microsoft web redis redissessionstateprovider' is typically encountered in web applications that use Redis as a session state provider. The error indicates that the application is unable to locate or load the specified type.
This could be caused by several reasons such as missing or incorrect assembly references, outdated versions of assemblies, or improperly configured settings in the web.config file. Additionally, this error may also occur if Redis Session State Provider DLL files are missing or not correctly installed on the server.
To resolve the 'could not load type microsoft web redis redissessionstateprovider' error, several solutions can be tried. Firstly, make sure that all necessary Redis Session State Provider DLL files are installed and located in the correct directories. Also, ensure that the assemblies being referenced in the application are up-to-date and match the versions mentioned in the web.config file.
Another potential solution is to check the web.config file for any misconfigured settings related to Redis Session State Provider. Ensure that the connection string and other settings are properly set up and match the configuration settings of the Redis instance. If everything appears to be in order, restart the application pool or web server to see if that resolves the issue.
Lastly, it may be worth considering reinstalling the Redis Session State Provider to ensure all necessary files are present and correctly configured. By following these steps, the error should be successfully resolved, and Redis can be used as the session state provider for your web application.