Error connecting to database in file.wiki. Database has unknown format version=7 [wikidPad 1.7]

Solution: Upgrade the wikidPad to the latest version (1.9 beta 10)

Condition:
When I open a wikid file (MyWiki.wiki), I met the following message:


I used the wikidPad 1.7 to open a wikidpad file saved with wikidPad 1.9. So I installed the latest version of wikidPad 1.9 to open the wikidpad file again.