Loadrunner recording error while uploading file

Dear All,

I am using Loadrunner 12.00 for Web(HTTP/HTML) scripting.  

During VuGen recording, I need to upload .docx file but i am getting the error "Error while uploading file: {}"

When i click the browse button, i get a new window or dialog/browse box to select file, i select the file and i get the error  "Error while uploading file: {}" or tried to enter the path in the dialog box and i get the same error

Kindly advise

Thanks