The Sugar SOAP Web Services APIs are used to exchange data between Riva and Sugar. Many Linux distributions include PHP 5.3 or higher as the default version of PHP.
If you are running an older version of Sugar SOAP Web Services APIs, it might not support PHP 5.3.
Even though Sugar 6.0 was certified with compatibility for PHP 5.3, full compatibility was not available until version 6.0.1.
For Riva, PHP 5.3 is incompatible with ALL versions of Sugar prior to 6.0.1.
Do one of the following: