Cagefs Problem WHM

[msn]

I click cagefs in whm but ı see an error.

Error:

No response from subprocess (/usr/local/cpanel/whostmgr/docroot/cgi/addon_cagefs.cgi) with exit signal: 2

after i write /usr/local/cpanel/whostmgr/docroot/cgi/addon_cagefs.cgi

come some error

Cant locate YAML/Syck.pm in @INC (@INC contains: /usr/local/cpanel /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at /usr/local/cpanel/Cpanel/CPAN/YAML/Syck.pm line 8.
BEGIN failed--compilation aborted at /usr/local/cpanel/Cpanel/CPAN/YAML/Syck.pm line 8.
Compilation failed in require at /usr/local/cpanel/Cpanel/CachedDataStore.pm line 10.
BEGIN failed--compilation aborted at /usr/local/cpanel/Cpanel/CachedDataStore.pm line 10.
Compilation failed in require at /usr/local/cpanel/Cpanel/LicenseComponent/Cache.pm line 10.
BEGIN failed--compilation aborted at /usr/local/cpanel/Cpanel/LicenseComponent/Cache.pm line 10.
Compilation failed in require at /usr/local/cpanel/Cpanel/LicenseComponent.pm line 14.
BEGIN failed--compilation aborted at /usr/local/cpanel/Cpanel/LicenseComponent.pm line 14.
Compilation failed in require at /usr/local/cpanel/Whostmgr/ACLS.pm line 10.
BEGIN failed--compilation aborted at /usr/local/cpanel/Whostmgr/ACLS.pm line 10.
Compilation failed in require at /usr/local/cpanel/whostmgr/docroot/cgi/addon_cagefs.cgi line 29.
BEGIN failed--compilation aborted at /usr/local/cpanel/whostmgr/docroot/cgi/addon_cagefs.cgi line 29.

whats this problem?
What can i solved?