Debug Assertion Error

[goofy1969]

I am trying to read an input file that has single and double quotes. I get an error message that reads: Debug Assertion Error...Expression: (unsigned)(c+1) <=256 Can someone point me in the right direction on how to go about either skipping this char or ignoring it?

[mof]

Some more info, like the relevant source code, would be helpfull.