I have code but I can't enact this code because the files in it are xml type and need to compile these files. I cannot find the error or open the PDB file.
XML files can't be "compiled" - its used for encoding documents in a format that is both human-readable and machine-readable and usualy holds data or configuration settings.
PDB files could be debuging informations of executable file (http://support.microsoft.com/kb/121366) or maybe "The Protein Data Bank" format (http://www.wwpdb.org/docs.html).