I am trying to deploy a report to the server with a custom assembly for the first time. I am able to deploy the same report without the assembly. I am using Reporting Servic
I had similar problems. I only had it in the public assemblies. Once I added the dll to the private assemblies location it worked. Are you running VS as administrator?
It turned out I needed to copy the dll to this folder on the report server: %ProgramFiles%\Microsoft SQL Server\MSRS10_50.MSSQLSERVER\Reporting Services\ReportServer\bin
That is the only place it is needed on the report server if you just want to deploy reports to it.
Another solution is to deploy your assembly to GAC. You will need to "strong name" it to be able to deploy to GAC. When it is in GAC, you don't need to have it in Reporting Services\ReportServer\bin