Acrobat Javascript

importDataObject (to attach a pdf file) is not working in Acrobat DC. Also not throwing any errors. I got strucked in that. Someone help me. I need a javascript code to attach a pdf file inside a main pdf file.

Note: importDataObject is woking fine in "Adobe Acrobat X Standard", but not working in "Acrobat DC Pro". Is this a bug in Adobe Javascript?

My Code is - -  this.importDataObject("Checklist", Checklist_Path);

Checklist_Path is a variable having the pdf file path with forward slashes.

Help appriciated. Thanks.