multi-threaded file reader error

I am getting this error " The multi-threaded file reader should be used only if  the maximum row size is less than <100000>. Check the file for bad data, or redefine the input schema for the file by editing  the file format in the UI."

I am able to load the files when they are small but I am not able to load the files when they are huge.

Could you please help me how to deal with this error.

Thanks in Advance.