Petapoco T4 template error

Running transformation: System.ArgumentException: URI formats are not supported.
   at System.IO.Path.NormalizePath(String path, Boolean fullCheck, Int32 maxPathLength)
   at System.IO.Path.GetFullPathInternal(String path)
   at System.IO.FileInfo.Init(String fileName, Boolean checkHost)
   at System.IO.FileInfo..ctor(String fileName)
   at Microsoft.VisualStudio.TextTemplating9E35D00624E5BD82B19A3253458F115B2EF01D5BEAD749E6192C7E6A11100BC0D10D33C5FD873531EDCA6693C5C78F6D0D7D91072377A74B385A0D815D76F2B7.GeneratedTextTransformation.GetProjectPath()
   at Microsoft.VisualStudio.TextTemplating9E35D00624E5BD82B19A3253458F115B2EF01D5BEAD749E6192C7E6A11100BC0D10D33C5FD873531EDCA6693C5C78F6D0D7D91072377A74B385A0D815D76F2B7.GeneratedTextTransformation.GetConfigPath()
   at Microsoft.VisualStudio.TextTemplating9E35D00624E5BD82B19A3253458F115B2EF01D5BEAD749E6192C7E6A11100BC0D10D33C5FD873531EDCA6693C5C78F6D0D7D91072377A74B385A0D815D76F2B7.GeneratedTextTransformation.GetConnectionString(String& connectionStringName, String& providerName)
   at Microsoft.VisualStudio.TextTemplating9E35D00624E5BD82B19A3253458F115B2EF01D5BEAD749E6192C7E6A11100BC0D10D33C5FD873531EDCA6693C5C78F6D0D7D91072377A74B385A0D815D76F2B7.GeneratedTextTransformation.InitConnectionString()
   at Microsoft.VisualStudio.TextTemplating9E35D00624E5BD82B19A3253458F115B2EF01D5BEAD749E6192C7E6A11100BC0D10D33C5FD873531EDCA6693C5C78F6D0D7D91072377A74B385A0D815D76F2B7.GeneratedTextTransformation.LoadTables()
   at Microsoft.VisualStudio.TextTemplating9E35D00624E5BD82B19A3253458F115B2EF01D5BEAD749E6192C7E6A11100BC0D10D33C5FD873531EDCA6693C5C78F6D0D7D91072377A74B385A0D815D76F2B7.GeneratedTextTransformation.TransformText()	C:\inetpub\wwwroot\tvpp\adminwebsite\Models\Generated\Database.tt	1	1	adminwebsite