Running QGIS 2.18 on Mac OS 10.14. Python 2.7 and GDAL 2.1 installed.

Trying to clip raster by polygon. (raster--> extraction --> clipper)

Get error message. ("qgis 2.18 clipper The process failed to start. Either the invoked program is missing, or you may have insufficient permissions to invoke the program.")

Then QGIS crashes, gives the following message:

"Process: QGIS [4831] Path: /Applications/QGIS.app/Contents/MacOS/QGIS Identifier: org.qgis.qgis2 Version: 2.18.28 (2.18.28 [exported]) Code Type: X86-64 (Native) Parent Process: ??? [1] Responsible: QGIS [4831] User ID: 501 Date/Time: 2019-04-17 23:41:07.988 +0200 OS Version: Mac OS X 10.14.2 (18C54) Report Version: 12 Anonymous UUID: 920AA060-0540-B21D-7AD7-A6AF2928F792 Time Awake Since Boot: 4700 seconds System Integrity Protection: enabled Crashed Thread: 0 Dispatch queue: com.apple.main-thread Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x00003e10c0113cd0 Exception Note: EXC_CORPSE_NOTIFY Termination Signal: Segmentation fault: 11 Termination Reason: Namespace SIGNAL, Code 0xb Terminating Process: exc handler [4831] VM Regions Near 0x3e10c0113cd0: JS JIT generated code 0000249fa5400000-0000249fdd400000 [896.0M] rwx/rwx SM=NUL reserved VM address space (unallocated) --> MALLOC_NANO 0000600000000000-0000600010000000 [256.0M] rw-/rwx SM=PRV "

what's going on ?

Why does raster clipper not work ?
more lines follow

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