CMK version : 1.6.0p6.cee
OS version : CentOS Linux release 8.0.1905 (Core) / Redhat 8
Error message :
Description of the problem : Call to undefined function json_decode()
The rhel8 installer misses the dependency for php-json.
Once the nagvis snapin is activated the Snapin breaks, the Nagvis page is not usable due to the error message seen above.
Once php-json is installed, everything works fine.
If you encounter this problem, use the following:
yum install php-json