I have a permanent error with AP27 opencl_ati. WU starts and after a few seconds goes into state "postponed for 60 sec". After a minute, this is repeated.
In the file stderr.txt I have this:
AP26 OpenCL 10-shift search version 2.6 by Bryan Little and Iain Bethune
Compiled May 9 2019 with GCC 8.1.0
Command line: projects/www.primegrid.com/ap27_2.6_opencl_windows64.exe 77175972 77176093 640
Vendor: Advanced Micro Devices, Inc.
Driver: 1800.11 (VM)
Using generic sieve kernel.
OpenCL memory allocation error, restarting in 1 minute.
My GPU is Radeon HD 6970, 2 Gb video memory. Driver is amd-catalyst-15.7.1-win10-64bit. This is the latest driver for this graphics card on the AMD site. Other Primegrid GPU applications (Genefer, PPS-Sieve) work without errors, GPU applications of other projects also work normally.
What could be the cause of OpenCL memory allocation error?