the job server is not able to read the ISJobServerGroup information when starting up
are you using SQL Anywhere 12.0 as IS Repo, if yes then do the following
open a command window
cd to %LINK_DIR%\bin
Run the ODBCDriverManager.exe and for all the versions of SQL Anywhere, set the driver as SQL Anywhere 12.0 driver
Restart the Job Server
Run the Task