I found it out!
I think the “pageItems.item was not defined totaly, so here is the working one!

Script:

main();
function main(){

var i, j, allGraphics,
allGraphicsArrays = app.activeDocument.pages.everyItem().allGraphics;

for (var i=0; i<allGraphicsArrays.length; i++) {
var myObject = allGraphicsArrays[i];
for (var j=0; j<myObject.length; j++) {
try{

myObject[j].clippingPath.appliedPathName = myObject[j].clippingPath.photoshopPathNames[0];
myObject[j].clippingPath.clippingType = ClippingPathType.PHOTOSHOP_PATH;

}
catch (myError) {
alert(“Selected image does not have a Photoshop path applied”)
}
}}
}