Error PHP graphics

[rmelao]

Hello, my name is Robson and I'm having PHP errors to generate the graphics....

06/01/2019 11:30:07 - CMDPHP PHP ERROR WARNING Backtrace: (/poller_commands.php: 112 run_data_query)(/lib/data_query.php: 154 update_poller_cache_from_query)(/lib/utility.php: 103 poller_update_poller_cache_from_buffer)(/lib/utility.php: 541 sizeof)(CactiErrorHandler)(/lib/functions.php: 4585 cacti_debug_backtrace)
06/01/2019 11:30:07 - ERROR PHP WARNING: sizeof(): Parameter must be an array or an object that implements Countable in file: /usr/share/cacti/site/lib/utility.php on line: 541

I need Help???
Tks

[netniV]

You are using a version of PHP that is not supported by the version of Cacti that you are running.