Symptoms
When try to use the K2 Designer We receive the next error message
Could not load file or assembly 'K2Field.K2Forms.Controls.Literal' or one of its dependencies,
This error appears after we do a deploy.
Diagnoses
N/A
Resolution
The 'K2Field.K2Forms.Controls.Literal' is a control on the community site. (And does not come standard with K2) The control might not be installed on the target environment. When trying to use that control in the "target environment", the assembly was not found, and threw the error.
http://community.k2.com/t5/K2-blackpearl/HTML-Literal/ba-p/80400
If this control was registered in your development environment and used in a view/form that was deployed to the test environment or environment that giving the error, you will also need to register this custom control in your test environment to resolve the issue.