Ubuntu 18.04 LTS, ROS, Failed to load Python extention for LZ4 support. LZ4 compression will not be avilable

Question

I'v been writing a code to extract images from bag file

I don't get any error messages but this

Failed to load Python extension for LZ4 support. LZ4 compression will not be available

I use conda environment and my python version is 3.6.13

ros-roslib 1.14.6 ros-roslz4 1.14.10.1 rospkg 1.3.0

And I also installed lz4 with pip,pip3.

Failed to load Python extension for LZ4 support. LZ4 compression will not be available

I used the method from the url above but my problem is still not solved

What should I do?

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