Hi there,
I was running a moodle in 2.7. That was working fine. After a while I installed a new webserver and migrated the whole moodle to that server. After doing this I did an upgrade to moodle 3.0.5.
There were no errors at that moment. But our theme required a higher version. So I tried to upgrade my 3.0.5. version to 3.1.2. Everything works fine up to when the database has to be changed.. the first thing that happens is: _
DDL sql execution error

More information about this error

Debug info: Key column 'tagtype' doesn't exist in table
CREATE INDEX mdl_tag_tagtag_ix ON mdl_tag (tagcollid, tagtype)
Error code: ddlexecuteerror
_
And it will not continue... Been trying to fix this for 2 days and am at a loss. Does anyone know what I should do?
thanx in advance
pascal Geuze