Basically, you need to update your default DB to add support for new maps added post-6.0.0. The new maps include Burma and Thailand.
The MP expects to find basic information for ALL maps inside the DB. Your MP is looking for Burma and Thailand in the default DB, but there is no relevant information in there.
Go to the Downloads site and you will find SQL scripts that update (add) Burma and Thailand information to a DB.
Gec,
in your MP-admin webpage you have the list of the active maps.
Any map is linked to the "default" database, except for the campaigns you're running where you have set the customized database.
You should read the entire map list but the some rows could be missing if your "default" database doesn't have entries for them.
You "default" database doesn't seem updated. It should contains references to all maps into various tables (as sector_season ect). Probably, the last two maps are missing there.
It is not mandatory. But you do need a "default DB connection" for the MP. You can use ANY sector DB for the default connection, or you can use a Reference DB.
Whatever you choose to use a your default DB, it MUST contain header information for ALL sectors defined in your MP. It seems that you don't have information for Burma or Thailand, so you must add this information to your default DB.
Go to MP-Admin.php in your browser. The top line shows the default DB connection. That is the DB you need to add the header information to.