Recently had a customer that was receiving an error when attempting to save a project.  The project had in excess of 5000 lines.  Project Professional produced the rather vague error you see below.

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The error that showed up in the queue was equally useless

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Fortunately the ULS logs was more helpful.  Without increasing the verbosity at all I was able to search on the project name and get a hit. 

  SNAGHTML353525a

   

The list view threshold is located in Central Administration at

  • Application Management –> Management Web Application
  • Select Web Application
  • In Ribbon, click on General Settings drop-down and choose Resource Throttling
  • The current List View Threshold was 5000
  • In this case I increased it to 7500 and save the setting

Upon making this change I was able to successfully save the project