" Function #xyz # has been incorrectly called " more often than not means, your code is trying to call an abstract method (in your case Posting:: getProjectPostingType), where you should actually be constructing an object of the child and invoke the child method.. It could either be a code mistake or an incorrect/empty type (that is responsible for the construct). 99 out of 100 times, this should be the cause. Check an confirm if it is your case. If not, let's look at the other possibilities..
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