--- a/multigps.xml	Wed Apr 05 10:06:47 2017 -0400
+++ b/multigps.xml	Wed Apr 05 10:15:16 2017 -0400
@@ -188,8 +188,8 @@
                     <validator type="unspecified_build" />
                 </param>
                 <expand macro="param_experiment_type" />
-                <param name="condition_name" type="text" label="Condition name" />
-                <param name="replicate_name" type="text" label="Replicate name" />
+                <param name="condition_name" type="text" optional="false" label="Condition name" />
+                <param name="replicate_name" type="text" optional="false" label="Replicate name" />
                 <expand macro="cond_fixedreadcount" />
             </repeat>
             <repeat name="control_repeat" title="Control" min="0">
@@ -197,14 +197,14 @@
                     <validator type="unspecified_build" />
                 </param>
                 <expand macro="param_experiment_type" />
-                <param name="condition_name" type="text" label="Condition name" />
+                <param name="condition_name" type="text" optional="false" label="Condition name" />
                 <conditional name="specify_replicate_name_cond">
                     <param  name="specify_replicate_name" type="select" label="Specify replicate name?" help="Optional for control.  If used, the control will only be used for the corresponding named signal replicate">
                         <option value="no" selected="True">No</option>
                         <option value="yes">Yes</option>
                     </param>
                     <when value="yes">
-                        <param name="replicate_name" type="text" optional="True" label="Replicate name"/>
+                        <param name="replicate_name" type="text" optional="true" label="Replicate name"/>
                     </when>
                     <when value="no" />
                 </conditional>