Using LR 5.7 and trying to print but am getting the message:"there is one photo in this print job which is missing its source file, It will not be printed". When i say continue the paper feeds through and nothing prints. How to correct problem?
It says that the source file is missing which means that the original location of this file in Lightroom is missing.
If you know where the file is originally stored then you need to first relocate the file in Lightroom Library module and then, print it.
Refer this article for steps to relocate : How to find missing photos in Photoshop Lightroom