AFAIK, Microsoft.ReportingServices.RdlObjectModel.dll was unsupported and was available in SSRS 2008. In SSRS 2008 R2, it was marked as internal so one cannot use this assembly. Instead, this got moved into the Microsoft.ReportingServices.Designer.Controls.dll assembly. Why am I telling you this? Simply, to identify what could be the reasons. At the moment, I can think of
So, if any of the above is the case, then share it with us. Moreover, which folder did you delete? Please mention that as well.
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Proxy Error The proxy server received an invalid response from an upstream server.The proxy server could not handle the request GET Reports/Reserved.ReportViewerWebControl.axd.Reason: Error reading from remote server