"Error: Cannot hold value outside clock edge" ?

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an asynchronus assignment acting in parallel to a clock synchronous assignment within the same process

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I think this IS the problem.. Here is the relevant part of the code

process(Reset,Clock,RS232InInt,PLLValid )
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elsif(PLLValid'Event and PLLValid='1') then
		 I_PLLOutput<=CONV_INTEGER(PLL);
		 S_PLLValid<='1';
	  elsif(S_PLLValid='1') then
		S_PLLValid<='0';

I tried to put the signals menioned in the error in the sensitivity list but that did not work. How do I change the code ?

Thanks !