You may run a roaming profile environment with Eclipse and from time to time it may start up with an error message like Invalid Configuration Location telling you The configuration area at C:\Users\[username]\.eclipse\...\configuration could not be created. Please choose a writable location using the '-configuration' command line option.
![The configuration area at C:\Users\[username]\.eclipse\...\configuration could not be created. Please choose a writable location using the '-configuration' command line option.](/sites/default/files/nodes/story/62/2014-03-27_184016_anonymized.png)