retroarch error

I typed in terminal retroarch to load it up. Then I browsed to user/lib to open mupen64plus core file.
then I load a rom and I get this error.
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RetroArch [WARN] :: system_directory is not set in config. Assuming system directory is same folder as game: "".
Sinc resampler [SSE]
SINC params (8 phase bits, 16 taps).
mupen64plus: Unable to open rom database file '/media/removable/USB Drive/Emulators/N64//mupen64plus.ini'.
mupen64plus: Goodname: Banjo-Kazooie (unknown rom)
mupen64plus: Name: Banjo-Kazooie
mupen64plus: MD5: B29599651A13F681C9923D69354BF4A3
mupen64plus: CRC: a4bf9306 bf0cdfd1
mupen64plus: Imagetype: .z64 (native)
mupen64plus: Rom size: 16777216 bytes (or 16 Mb or 128 Megabits)
mupen64plus: ClockRate = f
mupen64plus: Version: 1448
mupen64plus: Manufacturer: Nintendo
mupen64plus: Cartridge_ID: 4b42
mupen64plus: Country: USA
mupen64plus: PC = 80100400
mupen64plus: Save type: 5