This page is an attempt to document a somewhat cryptic error message that Atlassian products sometimes display and hopefully provide more meaning to the message.
Scenario
This can occur when installing a Marketplace app, but does not have a known cause.
The full text of the error message reads:
We ran into a little trouble
Unfortunately, we're unable to process your request. Please retry again in some time.

Workaround
Waiting a while and repeating the operation is currently the best known workaround for this error message.