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I tried to put the signals menioned in the error in the sensitivity list but that did not work.
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The Quartus handbook chapter I referred you to through the other thread has several register examples. They all have only clock and asynchronous inputs like reset in the sensitivity list.
The sensitivity list in the code you showed has something called "Clock" and also PLLValid, which is used in "PLLValid'Event and PLLValid='1'". PLLValid appears to be used as a clock. You should have only one clock in a process. This appears to be the problem markman was trying to solve with the suggested code change.
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