I was trying to submit my PDB and i found this message:
An error has occurred, here are the details: invalid literal for int() with base 10: ’ 54B’
Can you help me?
Thanks for reporting this, the error message is not correct in this case, something for us to fix. 
However this error indicated that there’s something wrong either with formatting of your PDB check if your PDB has insertions and if it follows the correct format.
There are several pdb related tools in: PDB-Tools Web