Resolving Error on Starting Simulation in Diesel Unsteady Flamelet Combustion

The diesel unsteady flamelet combustion model is set-up with a customized reaction input data (Chemkin files) that are complete and in order. However, on initializing and attempting to start iterating, Ansys Fluent gives an error shown below:
Error at host: Species h not in thermo database: C:/Testing/Therm.DAT
Error: Species h not in thermo database: C:/Testing/Therm.DATn
Error Object: #f

Please refer to the attached document below for stage-wise steps to resolve this error.