Do you have backups? Then you could restore the logs.
Did you only delete the log files or all the directories in the /var/log/ or what exactly did you delete?
Next time, don't delete, look on how to to a logroate!
Regarding the erorrsmessage, I'd assume that it either did not find the conrolog binary in the given path or is not able to create the symlink to the appropriate file due to missing /var/log/httpd/ispconfig_access_log. So what you could try is to recreate the path in case some dir is missing and the create and empty ispconfig_access_log file, e.g
Then try to restart ispconfig service (a reboot should not be necessary).