[Koha] problem in upgrading 3.20.00 to 3.20.04

[Ravi Wodeyar]

Sir,
I have a following problem after upgrading koha 3.20.00 to 3.20.04

*Software error:*

*Could not create file parser context for file
"/etc/koha/sites/library/koha-conf.xml": Permission denied at
/usr/lib/perl5/XML/LibXML/SAX/Parser.pm line 49*
*BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Auth.pm line
28.*
*Compilation failed in require at
/usr/share/koha/opac/cgi-bin/opac/opac-main.pl <http://opac-main.pl> line
23.*
*BEGIN failed--compilation aborted at
/usr/share/koha/opac/cgi-bin/opac/opac-main.pl <http://opac-main.pl> line
23.*

kindly help in solving the same
-- 
*With regards,*

*R.S.WODEYAR*
LIBRARIAN
PROUDHADEVARAYA INSTITUTE OF TECHNOLOGY
HOSPET - 583225
Cell:9448801708