Cannot convert lottie json to webp

Hi, I want to convert json to webp but get error:

F:\Github\python-lottie\bin>lottie_convert.py 2.json 3.webp
cannot import name 'PngRenderer' from 'lottie.exporters.cairo' (F:\Github\python-lottie\lib\lottie\exporters\cairo.py)
cannot import name 'export_png' from 'lottie.exporters.cairo' (F:\Github\python-lottie\lib\lottie\exporters\cairo.py)
Unknown exporter
Make sure you have the correct dependencies installed
For gif install lottie.exporters.cairo
For video install lottie.exporters.cairo

How to fix this? Thanks!!