error code 20-111

i'm getting a problem with my Sony Betacam SP deck, when i put in 30 min tapes it's fine but when i inset 60 or 90 min tapes and error code comes up (more specfically error code 20-111) i went through the diagnostics but in the middle of checking the menu shown on the monitor says CASSETTE UP/DOWN ERROR and ABNORMAL CASETTE DOWN FUNCTION. Any help would be greatly appreciated.

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