prblem in running fluka

Dear Friends,

I have a special problem while running fluka input file.If the no of history
is 1E6, then it is running and creating output properly, however, if the no of
history is changed to 1E7, it is giving an error message

"flutil/rfluka:line338:5186 aborted (core dumped)"

Can anybody please suggest me the way out of this problem.
 
I am attaching my input file for ready reference

Bakshi
BARC

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