On BOINC Project page:
climateprediction.net has 2 entries, each with work done and average work done.

Error message:
Sending scheduler request: Requested by user. Requesting 0 seconds of work, reporting 0 completed tasks
Scheduler request succeeded: got 0 new tasks
You used the wrong URL for this project
The correct URL is http://climateprediction.net/
You seem to be attached to this project twice
We suggest that you detach projects named climateprediction.net,
then reattach to http://climateprediction.net/
Already attached to a project named climateprediction.net (possibly with wrong URL)
Consider detaching this project, then trying again
Message from server: Invalid or missing account key. Visit this project's web site to get an account key.


I have suspended both of the projects and aborted the task that had been running.
The DELETE button is not available for either of the two projects.

Is there a way to manually remove all knowledge of the projects from BOINC and then start the project from scratch?

Don't.

It's a problem with the SAP server that is causing this.
See the CPDN News.