Dear Experts,

I am working on a CPU 1518-4 PN/DP, because we don't have the PLC program backup, we want to upload it instead from the PLC to go online to solve some issues and optimize the existing operation. 

I installed TIA Portal V15.1 as indicated in the PLC LCD display as the software used to create the program.

When uploading, it was suddenly aborted due to an error as shown in the attached picture.

Has anybody experienced the same? How should I go about it? Any work-around suggestion/s is very much welcome.

Thanks!