I'm trying to call a flow on click of a button in lightning component. It looks like nothing is happening. Im getting the below error.
Uncaught Error in $A.getCallback() [[object Object]]
Callback failed
I appreciate your help.

callIcleFlow : function (component) {       
                var flow = component.find("flowData");
                //Put input variable values
                var inputVariables = [
                      {
                        Connection_Mode : component.get("v.communicationChannel"),                       
                        Contact_Name : component.get("v.contactName")                        
                    } 
                   /* {
                        name : "Connection_Mode",
                        type : "String",
                        value : component.get("v.communicationChannel")
                    },
                    {
                        name : "recordId",
                        type : "String",
                        value : component.get("v.recordId")
                    } */

                ]; 
                //Reference flow's Unique Name
                console.log('input flow parameters ' + inputVariables); 
                flow.startFlow("CDI_ICLE_NCHG",inputVariables);                
         
    }

 

<lightning:button type ="submit" variant="brand" label="Next1" onclick="{!c.callIcleFlows}"/>
     <lightning:flow aura:id="flowData"/>