I wanted to create a custom exception message and thought it to the lightning component .. Does its possible ?

I am using the force:recordId interface in my component which is returning the records id and is there any way i can access subject name in lightning?

We ran into a problem with this custom template. One or more of the regions is rendering more than once. Fix the template or choose a different one.

I am getting this error when i am customing the componnet template pages 

<design:component label="Two Column Custom App Page Template">
    <flexipage:template >
        <!-- The default width for the "left" region is "MEDIUM". In tablets,
        the width is "SMALL" -->
            <flexipage:region name="left" defaultWidth="MEDIUM">
                <flexipage:formfactor type="MEDIUM" width="SMALL" />
            </flexipage:region>
            <flexipage:region name="right" defaultWidth="SMALL" />
  <flexipage:region name="right" defaultWidth="Large" />
       </flexipage:template>
</design:component>

I am trying to rerender the input rich text area on lightning based on the picklits value select .. but its not working .. can any one help me ? 

I am using the force:recordId interface in my component which is returning the records id and is there any way i can access subject name in lightning?