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The "Cannot resolve type" error in Xamarin.forms means that the compiler is unable to find and reference a specific type or class. This error can occur due to a number of reasons, such as the absence of a required assembly or framework, incorrect coding syntax or referencing issues.

The error can occur after each installation because the installation may have updated the framework or libraries, and the project references may not have been updated properly. This can cause the compiler to fail to find the required types or classes, resulting in the error message.

To resolve the issue, one must check if the required assemblies and frameworks are correctly referenced in the project, and update them if needed. It is also important to ensure that the coding syntax is correct and all references are properly configured.