How to solve FPDF error: File is encrypted? - fpdf

My FPDF was working nicely but suddenly it is making problem to generate pdf file.
Now when i am going to generate pdf it is showing an error
"FPDF error: File is encrypted!"
What is the problem? How can I fix it?
I have already tried with like this:
ini_set("pcre.backtrack_limit", "1000000000");
ini_set('memory_limit', '1024M');

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Check first, as in here, if you have a a link to an invalid png in another markdown cell.
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