Mcnp error the new source has overrun the old source

[gsyou]

mcnp error "the new source has overrun the old source"

I am a beginner with MCNP. This error really confused me. Who knows what this error means? Thank you.

 

[gsyou]

And the error is really tricky. When I set 5000 source histories per cycle on KCODE card, the error appeared every time at source particle no. 5688, and only one inactive cycle has run. But when I set 1000 source histories per cycle, the error disappeared, and MCNP seems run well. This really makes me confused. Does it imply any error in my input file?

 

[anas gul]

And the error is really tricky. When I set 5000 source histories per cycle on KCODE card, the error appeared every time at source particle no. 5688, and only one inactive cycle has run. But when I set 1000 source histories per cycle, the error disappeared, and MCNP seems run well. This really makes me confused. Does it imply any error in my input file?

dear, you just put a fifth entry in kcode. if your number of particles is 5000, then put 5000*2 = 10000 or 15000 as fifth entry in your kcode. then see how it works...