Errors When I try and Set up your plugins...?

Hi I get the following errors when I use your plugin...can you help please...
Thanks

Im on wordpress Version 4.7.3
Using SalientVersion: 7.6
The domain is burifeldfp.co.uk

Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /var/sites/b/burfieldfp.co.uk/public_html/2016/wp-content/plugins/wp-hummingbird/core/modules/class-module-minify.php on line 536

Warning: fopen(/var/sites/b/burfieldfp.co.uk/public_html/2016/wp-content/plugins/gravityforms/gravityforms.php) [function.fopen]: failed to open stream: No such file or directory in /var/sites/b/burfieldfp.co.uk/public_html/2016/wp-includes/functions.php on line 4783

Warning: fread(): supplied argument is not a valid stream resource in /var/sites/b/burfieldfp.co.uk/public_html/2016/wp-includes/functions.php on line 4786

Warning: fclose(): supplied argument is not a valid stream resource in /var/sites/b/burfieldfp.co.uk/public_html/2016/wp-includes/functions.php on line 4789