Qsys-script FAILED

Hi all,
Finally moved to sdk ver 13 but bumped into another issue.
aoc fails with the following message:
...
Error: Qsys-script FAILED
See all.log for details.

all.log shows the following (single) error message:
...
...... Error: add_connection acl_iface.kernel_irq all_system.kernel_irq: No interface named acl_iface.kernel_irq.
...

Any suggestions?
Thanks.