Not for nothing and not to frustrate you with a redundant answer but the logs usually never lie. I would double check that the plugin is actually installed, but as the error message says that it is also enabled. If you're getting those messages the system somehow can't find the toolkit and charting plugins, either the entire thing or specific modules. Based on the error message though it looks like specific modules might be disabled.
If you think they are installed and you think maybe they are enabled check again. :) For troubleshooting purposes, and so you can undeniably say I did this and I did that if you talk to support, just check again.
I wouldn't continue to use those fields until you solve the problem and get the errors in the logs to disappear though. Logs filed with errors are a problem waiting to happen. Get those sorted out.
One other thing worth checking is the logs to see whether or not those plugins show up in the list of enabled plugins. There's a laundry list of system information that appears after JIRA starts up that includes what plugins are installed. If you don't see those plugins in the list there's your answer. If you do see them, then it could be that a specific module is disabled in which case you should look at the plugin and its' modules to make sure the various modules related to those plugins are in fact enabled.
Here's what I'd look at to do that:
JIRA Charting: Date of First Response Module
Go to Administration>System>Plugins>Manage Existing>JIRA Charting Plugin>Manage Plugin Modules. You should see 16 of 16 modules enabled. Or however many, but they should all be enabled in the JIRA Charting plugin. If you see less than 16 modules enabled, that could be your issue. Look at the Date of First Reponse module and make sure it's enabled. If it isn't, try enabling it to see if that fixes that particular issue.
JIRA Charting Plugin: Time in Status Module
On the JIRA Charting plugin you also want to have a look at the Time in Status module and make sure that's enabled. That seems to be problematic as well.
JIRA Tool Kit: Participants Module
Same thing applies for the JIRA Toolkit's Participants module which seems to be having an issue according to your logs.
Administration>System>Plugins>Manage Existing>JIRA Toolkit Plugin>Manage Plugin Modules>Participants - make sure that's enabled.
One other thing you can try, if you have a test environment or some other environment where those plugins do work correctly, try comparing the two to see what might be different. Are the plugins installed? Are all the modules enabled? etc.
If none of that works, you can always file a support ticket and get some help from the folks at Atlassian - they will likely know best.
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