In rare cases FocusGTD will notify you about a database inconsistency. This typically means that some data no longer adds up.
While we haven't completely tracked down the problem causing this issue rest assured that there is some remedy for such situations.
First of all it is good to contact support in order to get help.
In case you synchronize your data with other clients one solution to the problem to delete the local database and re-synch again.
Usually this will rebuild the complete database and all inconsistencies should be gone.