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I got the following error sg while performing a merge

MyBB has experienced an internal SQL error and cannot continue.
SQL Error:0 - ERROR: syntax error at end of input LINE 1: ALTER TABLE mybb_users ^ Query:ALTER TABLE mybb_users

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As best I can find SQL error 0 is a failure to make the connection to the server.
If the problem occurs at line 1, it indicates the process couldn't get started.
Looking at your previous posts, it seems your server setup has been problematic.
It might help to describe your current server environment.

(2021-11-16, 11:24 AM)HLFadmin Wrote: [ -> ]As best I can find SQL error 0 is a failure to make the connection to the server.
If the problem occurs at line 1, it indicates the process couldn't get started.
Looking at your previous posts, it seems your server setup has been problematic.
It might help to describe your current server environment.

I was trying to perform 'merge' for phpbb3 with the Postgres database. 
While it started I prompted the error msg I shared. If you can ping me, I'll be able to answer your concern about the server environment. I'm using xampp to host MyBB also with the Postgres database.