Process exited with code 26 (0x1a)
From BOINC Wiki
Process exited with code 26 (0x1a) may be caused by improper starting or exiting of tasks, however, since that is recoverable you shouldn't see the error.
In another case it can be attributed to the science application being unable to access a file it needs, because said file is locked.
Report this error and the science application at the project forums.
