As Thomas pointed out, 3750 ME doesn't supports Stacking.
From the Q&A of 3750ME -
Q. Can Cisco Catalyst 3750 Metro Series Switches stack with the Cisco Catalyst 3750 Series, Cisco Catalyst 3550 Series, or Cisco Catalyst 2950 Series Switches?
A. No. At this time, the Cisco Catalyst 3750 Metro Series does not include StackWise stacking capability and cannot stack with other Cisco Catalyst 3750 Series Switches. The Cisco Catalyst 3750 Metro Series does contain StackWise stack ports, but they are not supported.
Q. Does the Cisco Catalyst 3750 Metro Series have Cisco StackWise technology?
A. Yes. The Cisco Catalyst 3750 Metro Series does have Cisco StackWise technology, but there is no plan to support this feature.
It does includes the stacking interfaces but looks like this is disabled in the IOS code itself, meaning the switch does has the capability but must be disabled in the IOS.
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