I solved the problem by replacing non-printable characters to nil, before writing to XML file. My regular expression is as follows. 
  # following is a code to remove non-printable characters in string i
+ncluding newline
  s/[^[:print:]]+//g;
  # this pattern won't remove newline char
  s/([\x00-\x09]+)|([\x0B-\x1F]+)//g;

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In reply to Re^2: XML::Simple parser error : Input is not proper UTF-8, indicate encoding by nvivek
in thread XML::Simple parser error : Input is not proper UTF-8, indicate encoding by nvivek

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