Temperature coefficients for lumped species: unphysical field variables

Hi all
I tried to implement a lumped reaction kinetics for which I need the BURCAT temperature coefficients for some lumped species, like pyrolysis vapor, coke, hydrocarbons and phenol, furan, naphthols. Since they are lumped, those will not directly be available in the database. Does anyone can give me an idea of where to get those temp coeff data from? Or any close values that could be used? I am actually getting out of bound errors coming from the specific heats-

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ERROR check_data_30.f:670
Fatal Error: Unphysical field variables detected.
I J K
2 3 47 C_PG = 0.000 <= 0.000
111 3 47 C_PG = 0.000 <= 0.000
2 3 66 C_PG = 0.000 <= 0.000
111 3 66 C_PG = 0.000 <= 0.000
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ERROR check_data_30.f:299
Unphysical field variables detected on one or more processes.
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