error occurs when loading the display point cloud.

X Error of failed request: BadWindow (invalid Window parameter)

Major opcode of failed request: 10 (X_UnmapWindow)

Resource id in failed request: 0x1a00001

Serial number of failed request: 204

Current serial number in output stream: 207

well, the NVIDIA installation has chosen to turn off OPENGL. The VTK in PCL needs to use OPENGL to display the point cloud.

solution: reinstall NVIDIA.