Recently Update Pro Site 3.5.0.4 and I get Error

Parse error: syntax error, unexpected T_PAAMAYIM_NEKUDOTAYIM in /hermes/waloraweb033/b1533/moo.monchosocom/bubbls/wp-content/plugins/pro-sites/pro-sites-files/lib/ProSites/Module/Taxamo/lib/Taxamo/Swagger.php

Recently updated the pro sites 3.5.0.4 plugin.
*I had to downgrade plugin so my website isn't down.