Uncaught Error in $A.getCallback() [TypeError: Cannot read property 'setParams' of undefined]
throws at https://growerslightning-dev-ed.lightning.force.com/auraFW/javascript/BC4wqH7bmsI7etc2sB4tmQ/aura_prod.js:1:27
    at Object.eval (eval at Nx (https://growerslightning-dev-ed.lightning.force.com/auraFW/javascript/BC4wqH7bmsI7etc2sB4tmQ/aura_prod.js:102:341), <anonymous>:52:23)
    at Object.<anonymous> (https://growerslightning-dev-ed.lightning.force.com/auraFW/javascript/BC4wqH7bmsI7etc2sB4tmQ/aura_prod.js:516:140)
    at G.kb (https://growerslightning-dev-ed.lightning.force.com/auraFW/javascript/BC4wqH7bmsI7etc2sB4tmQ/aura_prod.js:279:333)
    at WC.z.lj (https://growerslightning-dev-ed.lightning.force.com/auraFW/javascript/BC4wqH7bmsI7etc2sB4tmQ/aura_prod.js:567:295)
    at Object.Ky.lh (https://growerslightning-dev-ed.lightning.force.com/auraFW/javascript/BC4wqH7bmsI7etc2sB4tmQ/aura_prod.js:152:255)
    at G.kb (https://growerslightning-dev-ed.lightning.force.com/auraFW/javascript/BC4wqH7bmsI7etc2sB4tmQ/aura_prod.js:151:130)
    at zA (https://growerslightning-dev-ed.lightning.force.com/auraFW/javascript/BC4wqH7bmsI7etc2sB4tmQ/aura_prod.js:321:79)
    at AuraClientService.z.eg (https://growerslightning-dev-ed.lightning.force.com/auraFW/javascript/BC4wqH7bmsI7etc2sB4tmQ/aura_prod.js:351:149)
    at Object.Tk (https://growerslightning-dev-ed.lightning.force.com/auraFW/javascript/BC4wqH7bmsI7etc2sB4tmQ/aura_prod.js:564:388)
    at Object.Ky.lh (https://growerslightning-dev-ed.lightning.force.com/auraFW/javascript/BC4wqH7bmsI7etc2sB4tmQ/aura_prod.js:152:255)

`<aura:component controller="Requisition" implements="force:appHostable">
    <ltng:require scripts="/resource/jquery" />


 <link href='/resource/Styles/css/custom.css' rel="stylesheet"/>
 <aura:attribute name="source" type="SourceRequisition__c" Access="global"/>
  <aura:attribute name="Id" type="SourceRequisition__c"  access="global"/>`div class="col-sm-6">
                                <div class="col-xs-12">
                                    <div class="form-group label-floating">
                                        <label for="suppliername">Find</label>
                                        <input type="text" aura:id="Test2" class="form-control" placeholder="Requisition Title" value="" />

                                    </div>

</div></aura:component>

action.setParams({
        "SupllierName":component.find("Test2").get("v.value")||'',

     });
    action.setCallback(this, function(a) { debugger;
        if (a.getState()== "SUCCESS") { debugger;
            var v=a.getReturnValue();
            //debugger;
            component.set("v.source", a.getReturnValue());
            var myEvent = $A.get("e.c:SearchKeyChangeLightning");
           myEvent.setParams({"source": a.getReturnValue()});
           myEvent.fire();
        }  else if (a.getState() == "ERROR") {
            $A.log("Errors", a.getError());
        }
    });

    $A.enqueueAction(action);
}

public  static  List<SourceRequisition__c>findAll(string SupllierName)
   {
       String usrid = UserInfo.getUserId() ;
 String queryString ='select id,Name,Title__c from SourceRequisition__c where Active__c ='Yes'';
 if(SupllierName!=null && !SupllierName.equals('')){

    queryString += ' AND Title__c LIKE '%' + String.escapeSingleQuotes(SupllierName) +  '%'';
 }
 transient List<SourceRequisition__c> ss= database.Query(queryString);
  return ss;

 }