Error source and file names are the same

[Lori27009831a9x9]

Please help, I keep getting this message when i am trying to combine pdfs, I have tried moving them from the network to the desktop and it also isn't allowed. what is happening?  thank you!!!

[Peru Bob]

Have you tried changing the name of one of the pdfs?

[Lori27009831a9x9]

that seems to have done the trick i think they were way too long and so i couldn't do anything with them (despite the random error).thank you!

[Peru Bob]

You're welcome.