Bad Callback on running test script

[AnshShah3009]

[ERROR] [1697558138.151880, 148.512000]: bad callback: <bound method PlanBase.callback_depth of <PlannerLearning.PlannerLearning.PlanLearning object at 0x7f2a3e48b450>>
Traceback (most recent call last):
  File "/opt/ros/noetic/lib/python3/dist-packages/rospy/topics.py", line 750, in _invoke_callback
    cb(msg)
  File "/home/baymax/Desktop/agile_autonomy_ws/catkin_aa/src/agile_autonomy/planner_learning/src/PlannerLearning/PlannerBase.py", line 206, in callback_depth
    depth = self.bridge.imgmsg_to_cv2(data, '16UC1')
  File "/opt/ros/noetic/lib/python3/dist-packages/cv_bridge/core.py", line 163, in imgmsg_to_cv2
    dtype, n_channels = self.encoding_to_dtype_with_channels(img_msg.encoding)
  File "/opt/ros/noetic/lib/python3/dist-packages/cv_bridge/core.py", line 99, in encoding_to_dtype_with_channels
    return self.cvtype2_to_dtype_with_channels(self.encoding_to_cvtype2(encoding))
  File "/opt/ros/noetic/lib/python3/dist-packages/cv_bridge/core.py", line 91, in encoding_to_cvtype2
    from cv_bridge.boost.cv_bridge_boost import getCvType
ImportError: /lib/x86_64-linux-gnu/libp11-kit.so.0: undefined symbol: ffi_type_pointer, version LIBFFI_BASE_7.0

[AnshShah3009]

From my analysis, it looks like an opencv, cv_bridge and rospy compatiblity issue, Can someone suggest what version should i use. @antonilo what do you suggest?

[Hofalen]

i have the same issue, did you fix it?

[AnshShah3009]

@Hofalen The problem was related to libffi version in the conda environment. Try installing earlier subversion(3.7.x) of python in the conda env, should solve the issue.

[Hofalen]

@AnshShah3009 thanks for the quick answer! I proceed to install python 3.7.8 and it worked. I had the 3.7.17 before

[Cryptheon]

Another option would be to use ros_numpy and replace the lines of code with an equivalent (use numpify from ros) you don't need cv_bridge in this case.