TRENTON - New Jersey's fired education commissioner says he's learned he made a mistake that might have cost the state a $400 million federal education grant.

Bret Schundler says he found out Monday that the Department of Education discovered a draft of the state's application with notes in his handwriting removing key information.

Schundler said, "This was my error," in an interview with the Star Ledger. He said he doesn't recall making the error specifically but thinks he must have assumed the federal government wanted the most recent New Jersey budget information. The application sought budget data from 2008 and 2009.

Republican Gov. Chris Christie fired Schundler last week after a video contradicted Christie's statement the state had tried to correct the error during Schundler's presentation in Washington.

Schundler insists he didn't mislead Christie about what happened.

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AP wires contributed to this report.