RESOLUTION
If imaker doesn't start by executing the command:/hsphere/shared/SiteStudio/imaker.sh 1>/hsphere/shared/SiteStudio/var/error_log 2>&1 &
and failed with the following error: "Ambiguous output redirect"
As a solution, try running the following command:
/hsphere/shared/SiteStudio/imaker.sh > /hsphere/shared/SiteStudio/var/error_log 2>&1 &
or
/hsphere/shared/SiteStudio/imaker.sh >& /hsphere/shared/SiteStudio/var/error_log &