For those who maybe looking for the answer -
If you are getting this error with Viart installed on a webhost, try re-uploading Viart using "binary" mode.
If you are getting this error when installing on your local PC using xampp, then do the following:
Make sure you have a version of xampp that includes Zend Optimiser installed eg the latest version.
You then need to activate Zend like so:
In the following files:
xampp\apache\bin\php.ini
xampp\php\php4\php4.ini
xampp\php\php4\php.ini
xampp\php\php5.ini
xampp\php\php.ini
Find the zend section. Find the following line:
zend_optimizer.enable_loader = 0
Change it to:
zend_optimizer.enable_loader = 1
I only changed the php.ini in the apache folder and the php folder.
If you have any other problems, try googling the error message you receive.
Google knows everything