please help me.i can't add new library

hi
i'm recently starting to use Arduino,i have installed IDE 1.8.5 on win 10 while I want to add new library from manage library (for example sx1272 library) after download finish it show's below error:
invalid library found in c:\users\computer-name\documents\ Arduino\libraries\Arduino_799995
I can't add any library! neither online nor ofline
I attached screen shot at this post.
thank you for reading.

It's not clear what you're attempting to accomplish. There is no library named sx1272 in the Library Manager index. There are a couple of libraries that mention sx1272 in their descriptions, as shown in your screenshot:
http://forum.arduino.cc/index.php?action=dlattach;topic=518251.0;attach=238111
Are you trying to install one of those libraries or are you looking for a library named "sx1272"?

Whenever you open or close Library Manager it does a scan of all your libraries so if you happen to have any invalid libraries in your libraries folder it will always display that warning. It's not clear whether that actually has anything to do with your desire to install the "sx1272" library or if it's an unrelated warning that's acting as a red herring.

thank's for ypur answer.this library made by myself(it contains .h and .cpp file)
my problem solved.the problem was with my firewall.