You can only e-file up to 3 states per each return.
Per product information, "If you need to e-file taxes in more than one state, we can help. You can purchase additional states directly from inside TurboTax, and e-file in up to three states (fees apply*)."
You can print and mail in the fourth state return. If you already paid an additional e-filing fee for the 4th state, California, please contact us for a refund.
https://ttlc.intuit.com/replies/3300041