How to finally run an input file via VISED/MCNP5 without error?

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The user is experiencing errors while attempting to run a simulation of a UO2 sphere in MCNP5, specifically encountering a "bad trouble in subroutine pass1" and "unexpected eof in file" message. The issue appears to stem from the geometry section of the input file, as the visual editor crashes even after removing lines above this section. A solution was suggested involving the removal of unexpected characters, specifically "?" marks, which should be replaced with empty lines. After making these adjustments, the simulation ran successfully in a Linux environment. Proper formatting and attention to input file structure are crucial for resolving such errors in MCNP5.
nuclearsneke
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MCNP and eof error
Howdy, my fellow nuclear colleagues!

I am new to MCNP5 and currently I am trying to simulate something simple like a sphere of UO2 to calculate its critical size.
Whenever I run my file via MCNP5 or Vised, I get an error message like

bad trouble in subroutine pass1 of imcn

unexpected eof in file uo2crit0

I understand that problem is somewhere in geometry sector, because when I cut off all the lines above the geometry section, visual editor still crashes with lines specified before.

Detes are in the files attached.
 

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Hi,

You have ? chars where I would expect empty lines. When I fix that it seems to work for me. Checked in Ljnux.
 
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