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Tivaware 2.1 error in CCSv5

Other Parts Discussed in Thread: TM4C123GH6PGE

I have installed TivaWare_C_Series_2.1.0.12573 recently. I have imported examples for  tiva C launchpad (TM4C123GH6PGE) but all examples have 3 common which I am posting follow. My CCS version is 5.2

1. File devices/tm4c123ghpge.xml does not exist

2. gmake:*** No rule to make targer 'clean'

3. This project was created for a device variant that is not currently recognized: cortex M.TM4C123GH6PGE. Please install the device variant descriptor, or migrate the project to one of the supported device-variants

I don't have any idea to solve this error. How to install new device variant and from where to get right one?