File won't save in CS5 but does in CC need to make it back compatible

[Mattmcquiff]

This is my script, it runs fine in Photoshop CC but not on CS5.1 It does most of the script but will not save it comes up with the error

  save current document in file "Images3:2013-2014:WK99:Top:Top_WK99_PSD:TM15WA00124SV1RH.png" of current document as PNG with options {class:PNG save options, compression:1, interlaced:false} without copying

  --> error number -1728

Result:

error "Adobe Photoshop CS5.1 got an error: Can’t get current document." number -1728 from current document

set theFolder to POSIX path of (choose folder with prompt "Select Folder")

set theFolder2 to text 1 thru -2 of theFolder

log theFolder2

set dtF to paragraphs of (do shell script "find  " & quoted form of theFolder2 & " -iname \"*.PSD\"")

set tc to (count dtF)

repeat with i from 1 to tc

          set thefile to item i of dtF

          tell application id "com.adobe.Photoshop"

  activate

  open (alias thefile) showing dialogs never

                    set display dialogs to never

                    set thePath to do shell script "dirname " & quoted form of thefile

                    set SaveLocation to (POSIX file thePath) as string

                    set origName to name of current document

                    set myPNGOptions to {class:PNG save options, compression:1, interlaced:false}

                    tell current document

  --If the quick mask mode has been left on then delete the channel Quick Mask

                              try

  --for CS5

                                        if (quick mask mode) then delete channel ¬

                                                  "Quick Mask"

                              on error

  --for CS6 and up

                                        if (quick mask mode) then delete channel ¬

                                                  "Alpha"

                              end try

  --If the Layer is incorrectly labeled with Original Layer it needs renaming to original Image

                              if (exists layer "Original Layer") then ¬

                                        tell layer "Original Layer" to set name to "Original Image"

                              (delete layer "Original Image")

  --set hS to current history state

                              delete layer "BACKGROUND" of layer set "Dodge and Burn"

                              move layer "Main Image" of layer set "Dodge and Burn" to after layer set "Dodge and Burn"

                              delete layer set "Dodge and Burn"

  delete layer set "Retouch"

  trim basing trim on transparent pixels

  save in (SaveLocation & origName) as PNG with options myPNGOptions without copying

                              close without saving

                    end tell

          end tell

          set FileLocation to (POSIX file thefile) as string

          tell application "Finder" to delete FileLocation

end repeat

[Michael_L_Hale]

Older versions of Photoshop do not support png with compression.