I am working on a system related to a polymer chain. In a certain position, I need to introduce a functional group and need to find a TS structure of the reaction. In this case, while I set up a job, it ends with the following error message: 

"Unable to bracket maximum from both endpoints
Please check endpoints
Cumulative number of energy/gradient calls    :                 17

Message: Unable to bracket maximum from both endpoints
Message: Please check endpoints

... Calling mpi_abort ...

DMol3.pl message: DMol3 job finished..."

Can anyone help me to guide to resolve this error and the relevant reason of this message? Advance thanks to all, for your kind support and solution.

Keshab K. Adhikary