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

[xrh0905]

xrh0905@RPi3B:~/twofing $ DISPLAY=:0 ./twofing --debug
twofing, the two-fingered daemon
Version 0.1.6.20230112

Input device name: "wch Touch"
XInput device id is 8.
XInput device id for calibration is 8.
Start calibration
No calibration data found, use default values.
Calibration: MinX: 0; MaxX: 4096; MinY: 0; MaxY: 4096
Invert X Axis: No
Invert Y Axis: No
Swap Axes: No
Calibration Matrix:     1.000000        0.000000        0.000000
                        0.000000        1.000000        0.000000
Grab Result: 0
Reading input from device ... (interrupt to exit)
X Error of failed request:  BadWindow (invalid Window parameter)
  Major opcode of failed request:  20 (X_GetProperty)
  Resource id in failed request:  0x1
  Serial number of failed request:  43
  Current serial number in output stream:  43