Need Help With Typo Blog!

I’ve installed a Typo blog, but it sometimes acts extremely slow, (taking several minutes to load), and randmonly gives me this error:

Application Error
Typo Failed to Start Properly

Refreshing sometimes makes it work, and sometimes doesn’t.

Also, when I switch it to use certain themes, it will give me “Application Error (Apache)”.

Can anyone help me out with this? Thanks in advance.