In the code below, If I select Use_Snapshot, I see the right interface but somehow galaxy tries to execute the #else part and look for “m” input parameter. The example I have seen in documentation is using the script with same name in both if and else and the number of input arguments is the same as well. Any suggestions/ideas why always #else part gets executed although right interface appears based on user selection.

  <command>

    #if $source.source_select==“Use_Snapshot"

        cM-snapshot.sh $input $output

    #else

        cM.sh $m $b $ns $w $s $z $output

    #end if

</command>

<inputs>

 <conditional name="source">

    <param name="source_select" type="select" label="Specify the input">

        <option value="Use_Snapshot">Use Snapshot</option>

        <option value="Set_Values">Set Values</option>

    </param>

    <when value="Use_Snapshot">

     <param name="input" type="data" format="dbm" size="100" label="Input Snapshot"/>

      <sanitizer sanitize="False"/>

    </when>

    <when value="Set_Values">

      <param name="m"  label="Omega_m h^2"  type="float" value="0.1279" min="0.120" max="0.155"/>

      <param name="b"  label="Omega_b h^2"  type="float" value="0.0232" min="0.0215" max="0.0235"/>

      <param name="ns" label="n_s"          type="float" value="0.8629" min="0.85" max="1.05"/>

      <param name="w"  label="w"            type="float" value="-1.184" min="-1.30" max="-0.70"/>

      <param name="s"  label="sigma_8"      type="float" value="0.6159" min="0.61" max="0.9"/>

      <param name="z"  label="z"            type="float" value="1.0"    min="0.0" max="1.0"/>

      <sanitizer sanitize="False"/>

    </when>

 </conditional>

  </inputs>