Errors with Bleachbit 2.2 on Linux Mint 19 Tara

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Errors running Bleachbit on Linux Mint 19 tara.
Assistance to resolve this would be appreciated.
Terminal > sudo bleachbit
Here is the output:

All works, except for the following:

Error: system.cache: Command to delete /home/user/.cache/doc/by-app
Traceback (most recent call last):
File "/usr/share/bleachbit/Worker.py", line 83, in execute
for ret in cmd.execute(self.really_delete):
File "/usr/share/bleachbit/Command.py", line 84, in execute
FileUtilities.delete(self.path, self.shred)
File "/usr/share/bleachbit/FileUtilities.py", line 265, in delete
os.rmdir(delpath)
OSError: [Errno 38] Function not implemented: '/home/user/.cache/doc/by-app'
Error: system.cache: Command to delete /home/user/.cache/doc
Traceback (most recent call last):
File "/usr/share/bleachbit/Worker.py", line 83, in execute
for ret in cmd.execute(self.really_delete):
File "/usr/share/bleachbit/Command.py", line 84, in execute
FileUtilities.delete(self.path, self.shred)
File "/usr/share/bleachbit/FileUtilities.py", line 265, in delete
os.rmdir(delpath)
OSError: [Errno 16] Device or resource busy: '/home/user/.cache/doc'
Error: system.cache: Command to delete /home/user/.cache/wallpaper
Traceback (most recent call last):
File "/usr/share/bleachbit/Worker.py", line 83, in execute
for ret in cmd.execute(self.really_delete):
File "/usr/share/bleachbit/Command.py", line 84, in execute
FileUtilities.delete(self.path, self.shred)
File "/usr/share/bleachbit/FileUtilities.py", line 270, in delete
logger.info(_("Directory is not empty: %s"), path)
NameError: global name '_' is not defined

BleachBit version: 
2.2
Your operating system: 
Linux 19 Tara, Ubuntu 18.04

The issue was because Flatpak created a mount point in ~/.cache . There is information about how to get the fix from Git in this comment

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Andrew, lead developer