Error is:
"Step Not yet complete... here's what's wrong: 
An update to a Battle Station record with Weapon Status of 'Fully Operational' failed to post a Chatter message to the record. Make sure that the process is configured correctly and that it is activated. 
Note: you may run into errors if you've skipped previous steps."
And more i could see new battle station record being created after the current battle station record has been updated.
Please guide me to sort out this issue

Battle Station Trailhead -Step 4:Ad business logic
"Step Not yet complete... here's what's wrong: 
The validation rule does not appear to have the correct error formula. Make sure Exhaust Port Inspectors have > 150% utilization' 
Note: you may run into errors if you've skipped previous steps"

I have tried creation of new process bulider  and verified the complete module, its showing chatter message on record, but getting same error while doing 'Verify Step' . Anyone encounter this problem before? please help? 

Battle Station Trailhead -Step 4:Ad business logic
"Step Not yet complete... here's what's wrong: 
The validation rule does not appear to have the correct error formula. Make sure Exhaust Port Inspectors have > 150% utilization' 
Note: you may run into errors if you've skipped previous steps"