Exporting error from Character Animator via Adobe Media Encoder

Hi. I've been stuck for hours in this issue.

I would like to export video from Character Animator via Adobe Media Encoder but AME repeated saying "Could not read from the source. Please check if it has moved or been deleted" even the file is there. I tried to clear the cache as advised in old thread but no luck. Here I attached the error message, so it would be much appreciated if anyone helps me. 

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* Character Animator (Beta): version 4.3 (build 29)

* Adobe Media Encoder (Beta): version 15.3

* OS: macOS Big Sur (M1)

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- Source File: /Users/myname/Documents/birthday-usethis/birthday-usethis.chproj
- Output File: /Users/myname/Documents/birthday01.mov
- Preset Used: Apple ProRes 4444 with alpha
- Video:
- Audio:
- Bitrate:
- Encoding Time: 00:00:00
05/13/2021 03:49:34 PM : Encoding Failed
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Could not read from the source. Please check if it has moved or been deleted.

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