Eclipse - An internal error occurred during: “Compute launch button tooltip”

Question

I launched Eclipse earlier to jot down a snippet and was faced with the following as an error when I tried to run a fresh project:

An internal error occur

Answer 1

I had same error today - in an eclipse installation (Juno SR2 64bit) that has been running fine for months.

0: There were no changes on svn for my projects since yesterday (when it was running fine).

1: I restored the workspace from a 'Windows 7 -> Properties -> previous copy' backup. This failed because the directory structure of the '.metadata' contains folders with a deeper structure than is supported.

2: I restored the workspace from a overnight archive (gzipped so file depth is not an issue). This had no effect.

3: I tried to restore the eclipse installation directory (which seems to be updated an awful lot) from a 'Windows 7 -> Properties -> previous copy' backup. Again this failed - because of folder-depth issues (Note: it is installed in the root directory of my disk - so there is actually no way to use a restore on this installation!)

4: Had to delete the .metadata from my workspace and reinstall eclipse (and all the additional plugins), and re-import my projects, and setup all the servers, and android, etc, which took many hours.

The moral of the story? Backup both your workspace AND the eclipse installation every night manually. Windows Restore will NOT save you. Backing up your workspace is NOT enough.