I received this error message in PABLO_UCB_goal_KIX_CMYB tasks (on Windows - just as all of the others received this wu).
http://www.gpugrid.net/result.php?resultid=20930670
http://www.gpugrid.net/result.php?resultid=20932434

<core_client_version>7.14.2</core_client_version>
<![CDATA[
<message>
(unknown error) - exit code -98 (0xffffff9e)</message>
<stderr_txt>
# GPU [GeForce GTX 980 Ti] Platform [Windows] Rev [3212] VERSION [65]
# SWAN Device 0	:
#	Name		: GeForce GTX 980 Ti
#	ECC		: Disabled
#	Global mem	: 4095MB
#	Capability	: 5.2
#	PCI ID		: 0000:01:00.0
#	Device clock	: 1291MHz
#	Memory clock	: 3505MHz
#	Memory width	: 384bit
#	Driver version	: r358_00 : 35850
ERROR: file mdioload.cpp line 81: Unable to read bincoordfile
 
14:03:12 (2648): called boinc_finish

</stderr_txt>
]]>

same thing here this morning, with task e96s15_e25s125p0f255-PABLO_v3Q9UER7_MOR_18_IDP-0-2-RND4297_7

http://gpugrid.net/result.php?resultid=20997639

the task failed after 7.49 secs.