Installed Module "Taggable" Now Site is Unreachable

Moments ago I installed the Third Party module “Taggable” which I purchased from Devotee.

It installed correctly, then I selected create custom field “taggable” and assigned to a channel, when I clicked save, many php errors were reported which I pasted below.

Now when I try to load the homepage, or access the backend the browser just says waiting for (my domain) and after about 20 seconds it shows a white screen. I’ve emailed the developer but in the mean time seeing what I can do to disable modules to gain access again. Please help!

A PHP Error was encountered Severity: Notice Message: Undefined index: group_id Filename: cp/admin_content.php Line Number: 4216 A PHP Error was encountered Severity: Notice Message: Undefined index: field_name Filename: cp/admin_content.php Line Number: 4230 A PHP Error was encountered Severity: Notice Message: Undefined index: field_label Filename: cp/admin_content.php Line Number: 4244 A PHP Error was encountered Severity: Notice Message: Undefined index: field_name Filename: cp/admin_content.php Line Number: 4251 A PHP Error was encountered Severity: Notice Message: Undefined index: field_name Filename: cp/admin_content.php Line Number: 4258 A PHP Error was encountered Severity: Notice Message: Undefined index: field_type Filename: cp/admin_content.php Line Number: 4272 A PHP Error was encountered Severity: Warning Message: Cannot modify header information - headers already sent by (output started at /nfs/c06/h04/mnt/95572/domains/heavymark.com/sys/core/Exceptions.php:166) Filename: core/Common.php Line Number: 424

An Error Was Encountered site_id_mismatch
You must submit a field name
You must submit a field label

[Mod Edit: Moved to the Modules forum]