You are using Docker Desktop, which means, everything is in a virtual machine. Including that /host_mnt which is the folder that contains the shared folders you added to Docker Desktop in the Resources / filesharing settings
The debug message could be okay, I don’t remember how it should look like, but I edited your post to format it like described in our formatting guide
Regarding the cause of the error, it seems that the folder does not exist that Docker wants to mount. how did you define the volume? Can you share that part of your compose file (also following the previously linked formatting guide and using code blocks)?