Answered
By @jenn_3539
Click the little arrow (or press F5) to display the Module picker, where you can choose Develop.
You can also press D to go to Develop.
As for error 198, see the correct answer in this thread:

Sign up
Already have an account? Login
To post, reply, or follow discussions, please sign in with your Adobe ID.
Sign inSign in to Adobe Community
To post, reply, or follow discussions, please sign in with your Adobe ID.
Sign inEnter your E-mail address. We'll send you an e-mail with instructions to reset your password.
