wygwam error after move of server

HI, I am new to ExpressEngine. One of my clients has a website built in EE by another developer. We have just moved the site to a new server, and now we are getting the following errors, if anyone can help that will be great.

A PHP Error was encountered Severity: 8192 Message: Non-static method Wygwam_helper::replace_page_tags() should not be called statically, assuming $this from incompatible context Filename: wygwam/ft.wygwam.php Line Number: 562

A PHP Error was encountered Severity: 8192 Message: Non-static method Wygwam_helper::replace_page_tags() should not be called statically, assuming $this from incompatible context Filename: wygwam/ft.wygwam.php Line Number: 562

A PHP Error was encountered Severity: 8192 Message: Non-static method Wygwam_helper::replace_page_tags() should not be called statically, assuming $this from incompatible context Filename: wygwam/ft.wygwam.php Line Number: 562

A PHP Error was encountered Severity: 8192 Message: Non-static method Wygwam_helper::replace_page_tags() should not be called statically, assuming $this from incompatible context Filename: wygwam/ft.wygwam.php Line Number: 562

A PHP Error was encountered Severity: 8192 Message: Non-static method Wygwam_helper::replace_page_tags() should not be called statically, assuming $this from incompatible context Filename: wygwam/ft.wygwam.php Line Number: 562

A PHP Error was encountered Severity: 8192 Message: Non-static method Wygwam_helper::replace_page_tags() should not be called statically, assuming $this from incompatible context Filename: wygwam/ft.wygwam.php Line Number: 562

A PHP Error was encountered Severity: 8192 Message: Non-static method Trunchtml::usage() should not be called statically, assuming $this from incompatible context Filename: trunchtml/pi.trunchtml.php Line Number: 37

A PHP Error was encountered Severity: Warning Message: Cannot modify header information - headers already sent by (output started at /home/affinityassetfin/public_html/system/codeigniter/system/core/Exceptions.php:170) Filename: core/Common.php Line Number: 409

Many thanks Shuka