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UCC21540: UCC21540 incorporated into PSpice simulation of UCC28950. Error: There are no Transient section

Part Number: UCC21540
Other Parts Discussed in Thread: UCC28950,

Hello:

I am trying to incorporate UCC21540 into UCC28950 to simulate my design.

I got an error: "There are no Transient section in... " 

Simulation starts, working for some time and I can see the results, which look promising, but then it interrupts with this error.

Could you, please, advice, where is my mistake in this simulaiton?

Thank you