There are example config files in the DAMASK directory for different crystal structures and different sections (homogenization, phase, kinematics...). You should probably check out the syntax of Phase_Phenopowerlaw_cpTi-alpha.config to see the syntax for hexagonal materials. ( I am guessing you are using the phenopowerlaw)
In the current version these can be found in examples/config/...
Aritra Chakraborty Thank you for your response. The examples files are not updated on the website. I reached out to them and the error was due to they changed the way to define c/a ratio from "covera" to "c/a". Still in the example files on website it says "covera". That's why all the confusion.