"If [CapitalGainNetIncome] is greater than zero, then a binary attachment with the file name beginning with 'ScheduleD' must be present."
(Yes, the Schedule D is attached, and it has been named ScheduleD.pdf to comply with the Intuit required file naming convention.)
and its companion
"HI Corporation Information Worksheet: Name - One or more attached PDF file(s) have the type 'Other'. Remove thoese or change them to a different type."
(No, there are no files with type other. There are two required attachments, and the type for both is clearly accurate: "8453 Signature Document:IRS8453" for the one for the federal return and "Schedule D" for the one for the state return, as clearly shown when clicking on Attachments.)
Intuit tech support are, of course, utterly clueless and have no idea what is going on (where do they get these people? do they even know how to use a computer and have they ever even seen what the Intuit software is like? all they know to say is reboot, clear cookies and cache, remove pop-up blockers, when none of that applies to Intuit TT Business desktop software.)
Intuit: this is clearly a bug, as we've established that you do not do any QA. Please kindly release an urgent patch/fix to allow the filing of state (State of Hawaii here specifically, not sure what other states are so affected) C corp tax returns online.