seahub启动失败--in import_module;大神怎么解??

root@raspberrypi:/home/pi/yunpan/seafile-server-7.1.5# ./seahub.sh start

Starting seahub at port 8000 …
Error:Seahub failed to start.
Please try to run “./seahub.sh start” again
root@raspberrypi:/home/pi/yunpan/seafile-server-7.1.5# ./seahub.sh start-fastcgi

Starting seahub (fastcgi) at 127.0.0.1:8000 …
Traceback (most recent call last):
File “/home/pi/yunpan/seafile-server-7.1.5/seahub/seahub/avatar/models.py”, line 23, in
from PIL import Image
File “/home/pi/yunpan/seafile-server-7.1.5/seahub/thirdpart/PIL/Image.py”, line 94, in
from . import _imaging as core
ImportError: cannot import name ‘_imaging’ from ‘PIL’ (/home/pi/yunpan/seafile-server-7.1.5/seahub/thirdpart/PIL/init.py)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File “/home/pi/yunpan/seafile-server-7.1.5/seahub/manage.py”, line 10, in
execute_from_command_line(sys.argv)
File “/home/pi/yunpan/seafile-server-7.1.5/seahub/thirdpart/django/core/management/init.py”, line 364, in execute_from_command_line
utility.execute()
File “/home/pi/yunpan/seafile-server-7.1.5/seahub/thirdpart/django/core/management/init.py”, line 338, in execute
django.setup()
File “/home/pi/yunpan/seafile-server-7.1.5/seahub/thirdpart/django/init.py”, line 27, in setup
apps.populate(settings.INSTALLED_APPS)
File “/home/pi/yunpan/seafile-server-7.1.5/seahub/thirdpart/django/apps/registry.py”, line 108, in populate
app_config.import_models()
File “/home/pi/yunpan/seafile-server-7.1.5/seahub/thirdpart/django/apps/config.py”, line 202, in import_models
self.models_module = import_module(models_module_name)
File “/usr/lib/python3.7/importlib/init.py”, line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File “”, line 1006, in _gcd_import
File “”, line 983, in _find_and_load
File “”, line 967, in _find_and_load_unlocked
File “”, line 677, in _load_unlocked
File “”, line 728, in exec_module
File “”, line 219, in _call_with_frames_removed
File “/home/pi/yunpan/seafile-server-7.1.5/seahub/seahub/avatar/models.py”, line 26, in
import Image
ModuleNotFoundError: No module named ‘Image’
Error:Seahub failed to start.