Unable to fully sync rock 4c android10 code

Unfortunately, I take 2 days to sync the rock pi4c Android 10 code and it still failed.
how can i fix it? please

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This is err tips:

pi@build:~/worksapce:$ repo sync | > ~/repo.log
Fetching projects: 0% (3/737) platform/frameworks/baseerror: Cannot fetch rk/platform/vendor/rockchip/common (GitError: rk/platform/vendor/rockchip/common update-ref: fatal: a6b6c3558f8bafbdd5d5efe3aabdcd9dbce93fe2^0: not a valid SHA1
)
… and more

error.GitError: rk/platform/vendor/rockchip/common update-ref: fatal: a6b6c3558f8bafbdd5d5efe3aabdcd9dbce93fe2^0: not a valid SHA1