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TMS570LC4357: unable to run EMAC LWIP demo

Part Number: TMS570LC4357
Other Parts Discussed in Thread: HALCOGEN, , UNIFLASH

I downloaded the Emac Lwip demo Version 00.03.00 available at 

http://processors.wiki.ti.com/index.php/HALCoGen_Ethernet_Driver_and_lwIP_Integration_Demonstration#Download

but was unable to run it on my board:

I checked and the debugger selected in the project was XDS 100 v2 and changed it to XDS110 (the one on my TMS570LC4357),  but now I am unable to flash (debug) the code as it is giving the following error:

Texas Instruments XDS110 USB Debug Probe_0/CortexR5 : Target must be connected before loading program.