Getting macros to work in Excel 2010 .xlam Custom Ribbon

I have created an .xlsm file that I want to save as .xlam after I have it working properly.  I have simple macros in there that work just fine when run from the macro window (ALT+F8) or directly from the VBA Editor.  I added .xml code to create a custom ribbon with buttons to run the macros.  The ribbons and buttons show up fine, but I always get an error, "Wrong number of arguments or invalid property assignment."  I can immediately run the macros manually and they work just fine, so I guess there is something wrong with either the xml (I am quite the novice here on xml)  or there is a reference problem.  Any ideas?

Below is the xml I used for creating the custom ribbon/buttons and the xlsm file is attached
pmpExcelAddIns.xlsm

<customUI xmlns="http://schemas.microsoft.com/office/2006/01/customui">


  <ribbon>
    <tabs>
      <tab id="MyCustomTab" label="Case and Selections" insertAfterMso="TabHome">
				
  	  <group id="customGroup1" label="Adjust Case">
          <button id="customButton1" label="Lower" size="large" onAction="LowerCaseMacros" imageMso="LowerCase" />		
          <button id="customButton2" label="Upper" size="large" onAction="UpperCaseMacros" imageMso="UpperCase" />
          <button id="customButton3" label="Proper" size="large" onAction="ProperCaseMacros" imageMso="ProperCase" />
          <button id="customButton4" label="Sentence" size="large" onAction="SentenceCaseMacros" imageMso="SentenceCase" />
        </group>

        <group id="customGroup2" label="Decrease Selection">
          <button id="customButton5" label="Unselect current cell" size="large" onAction="UnSelectActiveCells" imageMso="SelectionPane" />
          <button id="customButton6" label="Unselect current area" size="large" onAction="UnSelectCurrentAreas" imageMso="_3DEffectsOnOffClassic" />
        </group>

      </tab>
    </tabs>
  </ribbon>

</customUI>

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