I am using Arduino 1.8.19 IDE, I downloaded lot of the libraries... somehow I got error when I open something else manager apps here it showed:
Invalid library found in C:user.........\Arduino\libraries\Arduino_POST_HTTP_Parser-1.0.0: Missing 'paragraph' from library
AND
C:user.........\Arduino\libraries\Arduino_POST_HTTP_Parser: Missing 'paragraph' from library
I did removed by manually with 'HTTP_Parser' and re-install and still the same.
Did you use the IDE library manager to install that library? If not, I would recommend that you delete it from your sketchbook libraries folder and install it with the library manager. It is available that way and the library manager is the best way to install any library.
What Arduino board are you using? What network shield?