open your http.conf file
vim /opt/lampp/etc/extra/httpd-xampp.conf
Comment "Deny from all" in the following section,
#
# New XAMPP security concept
#
<LocationMatch "^/(?i:(?:xampp|security|licenses|phpmyadmin|webalizer|server-status|server-info))">
Order deny,allow
#Deny from all
Allow from ::1 127.0.0.0/8
fc00::/7 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16
fe80::/10 169.254.0.0/16
ErrorDocument 403 /error/XAMPP_FORBIDDEN.html.var
</LocationMatch>
Edit:
Try to add "Allow from all" before "ErrorDocument" line.
Hope it helps.
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