Exporting mxds into pdfs using ArcPy?

I have written a python script to export my mxd into a pdf (not using data driven pages). I am getting the error that my mxd path is incorrect! I have included my script below. Any help would be appreciated.

# Necessary modules
import arcpy, os, string, sys

# For less complicated scripts -
# these 2 imports are necessary to utilize a simpler method of debugging outher than traceback 
import win32ui, win32con

# example debug message to screen ......
# arcpy.AddMessage("mxd_file = " + str(mxd_file))

# val = win32ui.MessageBox("mxd_file = " + str(mxd_file), "title",
                          #win32con.MB_OKCANCEL)

#Paramaters...

mxdList = string.split(arcpy.GetParameterAsText(0), ";")
dir = arcpy.GetParameterAsText(1)

#Loop thru & take the base name of each MXD selected and append all map pages to a single pdf 
# and save to chosen directory......


for mxdPath in mxdList:
    mxd = arcpy.mapping.MapDocument(mxdPath)
    name = mxdPath[:-4] + ".pdf"
    file = dir + os.sep + os.path.basename(name)
    ddp = mxd
    ddp.exportToPDF(file, "ALL")

del mxd, file