Hi, I reported a similar error for the earlier beta see here http://wp-types.com/forums/topic/cred-beta-error-on-clicking-edit/
Here's the error I am getting for CRED 1.3 beta3
Fatal error: Call to undefined method FieldConfig::setAttr() in /Users/markgray/Documents/Websites/hen.dev/wp-content/plugins/cred-frontend-editor/classes/CredForm.php on line 1043
Would be great to have a fix as I can't test the new CRED out locally.