Merging pdf files

[arshad_1341]

Merging pdf files into one fails with message, "Extraction is not allowed in source files". How can this be resolved?of files 

[try67]

Are you using Acrobat? The online service? Something else?

Does this happen with all files, or just some?

[arshad_1341]

I am using Adobe Acrobat mobile application. It happens with all files. I managed to merge all my files (19) finally using online with ilovepdf.com. Thanks for reply. I would still like to know why Adobe failed in merging/combining my pdf files where ilovepdf did it in a jiffy.