I need a solution for this issue: Parse error: syntax

I need a solution for this issue:

Parse error: syntax error, unexpected T_PAAMAYIM_NEKUDOTAYIM in /home/gobaby/public_html/wp-content/plugins/pro-sites/pro-sites-files/lib/ProSites/Module/Taxamo/lib/Taxamo/Swagger.php on line 185

I've already changed my PHP version.