The prior year adjusted gross income (AGI) entered for your spouse's electronic signature does not match what is currently on record with the state of California.
Fix #1: Sign into your PriorTax account and enter the correct AGI amount on your status page. Otherwise you cannot sign your return electronically.
Fix #2: You can still e-file by signing Form 8453-OL. To do this, sign into your PriorTax account and follow the on-screen instructions on your rejection status page.