I know exactly what you mean because the same happened to me. To fix the errors:
The no mapping error is because the drivers you are using. I believe/hope you are using a nvidia geforce based card. I read some post regarding that problem here in the forums, I just dont remember the exact driver version you need in order to run the game, but it fixes that.
The other problem is solved by downloading the new rom database file for PF64 released the 25'th of december.
Hope this helps in some sort of way.
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