CRM Development Toolkit deploy error

Error 1 Error registering plugins and/or workflows. The resource string "ErrorSerializingRegFile" for the "RegisterPlugin" task cannot be found. Confirm that the resource name "ErrorSerializingRegFile" is correctly spelled, and the resource exists in the task's assembly. C:\Program Files (x86)\MSBuild\Microsoft\CRM\Microsoft.CrmDeveloperTools.CrmClient.targets 176 4 CrmPackage

Solution:
RegisterFile.crmregister file is checked in, Check out file manually.