Service Unavailable When Installing The Cs-Cart

While installing CS-Cart after completing the process i am getting service unavailable message. Can you give me the suggestion to move the next step in CS-Cart Installation?

While installing CS-Cart after completing the process i am getting service unavailable message. Can you give me the suggestion to move the next step in CS-Cart Installation?

Please check the error message in the source code of the Service unavailable page and provide it here so we could help

Probably will see this at the bottom of your source:

PHP Fatal Error

Message
Class 'lessc' not found

Error at
app/Tygh/Less.php, line: 20

Backtrace

This is what I'm chasing now as well.