If you are positive that you didn't already e-file/paper file your return on an earlier date, you may be a victim of identity theft. You will have to file a paper state return instead of e-filing. The CA FTB has resources on identity theft here, including a form you should fill out.
You can access IRS resources on identity theft here. It's a good idea to get a jump on this, even if your federal return was accepted. You might have an issue with e-filing your federal next year if it turns out you are a victim.
TurboTax also has resources on identity theft here.
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