Process exited with code 201 (0xc9, -55)

From BOINC Wiki

Exit code 201 happens when your GPU goes bust. The error essentially means that a GPU that was detected earlier has gone missing.
Possible causes:

  • Your OS updated a driver to a version without the required components (OpenCL, CUDA).
  • You manually removed (part of) a driver.
  • Your GPU has broken.
  • Your motherboard has broken.
  • Virus or Malware.