APIC-EM Path trace issue

• We are on APIC-EM 1.4.3.1009. the majority of our switchs  are  C3750X, C3850X and C3560X. The core switch is C4500X. It seems the path trace is not working properly in our environment. Getting the following Error:
•  1. Not able to locate unique interface or host for source ip address X.X.X.Xle to
• Another issue is all the equipment is connected to one specific  switch A while doing path trace on APIC-EM, no matter where  they actually are.
• Was able to access the switch and found out IPDT has been enabled globally. The switch is  WS-C3750X-48P on15.2(1)E2. 

What technology is behind APIC-EM path trace. What configuration is needed on the switches to make sure APIC-EM is working properly.

Refer documents for more details:

 Cisco Path Trace Application on APIC-EM User Guide, Release 1.4.0.x - Overview [Cisco Application Policy Infrastructure …

 http://www.cisco.com/c/en/us/td/docs/cloud-systems-management/application-policy-infrastructure-controller-enterprise-mo…