added errors messages to address edge case - reload and accept/invite option persists
added errors messages to address edge case - reload and accept/invite option persists

Cal-CS-61A-Staff/ok,Cal-CS-61A-Staff/ok,jordonwii/ok,Cal-CS-61A-Staff/ok,jackzhao-mj/ok,jordonwii/ok,Cal-CS-61A-Staff/ok,Cal-CS-61A-Staff/ok,jordonwii/ok,jackzhao-mj/ok,jackzhao-mj/ok,jackzhao-mj/ok,jordonwii/ok