Hi Faraz,
Another option would be:
Firstly
please check SOLMAN_SETUP and make sure there are no problems in the,
- System
Preparation
- Basic
Configuration
- Managed
System Configuration (for managed system with the grey metric)
- Technical
monitoring Setup
If no issue
above to starting troubleshooting please look at the notes,
2016745 -
Grey metrics information required for analysis in technical monitoring with SAP
Solution Manager 7.1
2016715 -
Metric Troubleshoot with MAI Tools
This should give you some more information on exact error.
Kind Regards
Michael Foley