Problem: Your project contains discontinued modules or assemblies
With newer Sitefinity CMS versions, certain assemblies or modules are discontinued.
For example, Sitefinity Thunder is discontinued in Sitefinity CMS 11.0.
Solution
Remove the discontinued assembly or module and all its references.
Use Sitefinity VSIX as an alternative to Sitefinity Thunder.
Refer to Deprecated capabilities in Sitefinity CMS for a complete list of discontinued capabilities per product version.
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