I have a selectList setup like this...

<apex:selectList rendered="{!IF(aci['Type__c'] == 'PICKLIST','true','false')}" label="{!aci['Field_Label__c']}" value="{!plv[aciId + '.' + aci['Field_Name__c']]}" size="1" multiselect="false">
  <apex:selectOptions value="{!plvVals[aci['Object_Name__c'] + '.' + aci['Field_Name__c']]}"/>
</apex:selectList>

 The goal is that I have a dynamic series of selectLists that write back to a map.  Plv is simply a map of string,string.  When I go to display this if there is a value in the map it properly selects it, however when I go to save I get the error "An error occurred when processing your submitted information".  I put a debug line in the first line of my save code in apex and that never gets printed, so it never even makes it to the save statement.  Is what I am trying to do just not possible, thoughts?