I scanned all forum and I dont solve this problem. In my "/public_html/files/usageStats" folder there isn't any ScheduledTaskLogs folder. Like this:
And archive, processing, reject and stgaes folders are empty. But there are a lot of files in usageEventLogs folders. And these files begin when we update the ojs system from 2.4.2 to 184.108.40.206.
Really I searched the whole forum and all web but I didnt find the core problem and solution. When we upgrade system I think we forgot something. And I learned that it's too hard and professional to upgrade system.
Also I want to add addition information. In main folder, there is an error_log but it doesn't work. In error_log there is no information after upgrading.
I began this subject from statistics problem and I learned that when system doesnt produce log files unfortunately there isnt any statistics information.
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Thanks a lot and I think that this is a critical problem after upgrading system.