Want to highlight texts but not able to save the PDF file
I am not able to save a particular PDF file in any case. I encountered this problem when I had tried to save that PDF file after highlighting some of its texts. I further found that this PDF file cannot be saved even in a different name at some other location. Every time I try to save the file it shows "Reading Error (110)" as described in the attached image file.
It would be great if this problem can be resolved as this PDF file is a necessary textbook of one of the subjects that I need to study and in order to make efficient use of time, I want some of its texts to be highlighted for future use of this textbook PDF.
Thank you.

