Sorry you're stuck but there's almost always a pretty easy fix! Do NOT try to start all over again, eg. uninstall Max's Pitch Package, etc. That can make things worse.
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Maxlab grader showed me 2 error checkpoints saying i've missed "Meeting tab" on step 1-5 and "Meeting attendances" on step 117-121. Upon checking I am positive, i have completed above steps with no error. (please find screentshot below). after refreshing multiple time my grader app has not updated my grade, it would be a 100% instead of a 93%. what should i do to fix the grade error now?
Yeah, that is answered in the Help FAQ but basically you just need to uninstall the grader and install it again to get the updated version (due to a Salesforce update). Here are the instructions:
To uninstall the Max Labs Grader app:
Go to Setup
Then, on the lefthand menu, go to Apps > Packaging > Installed Packages
On the row for Max Labs Grader, click Uninstall
Then on the page that appears, scroll all the way down and click Do not save ... and then in the popup click Ok
Then check Yes, I want to uninstall...
Then click the Uninstall button below
Soon you'll get an email from SF saying you uninstalled and when you reload the Installed Packages page, the Max Labs Grader will be gone.
Then you can install the Max Labs Grader app again normally and it will be the new version (v91).