Unknown Controller Action

Question

I am trying to create a lightning component, but I get Unknown controller action 'getContacts' error when trying to load the page. What is the main reason I get that error?

Server-side Controller:

public class MatchedCorporateController {
    @AuraEnabled
    public static List<Corporate_Volunteer_Support__c> getContacts(Support__c support) {
       return [Select Account__c From Corporate_Volunteer_Support__c Where Support__c = :support];
    }
}

Lightning Component:

<aura:component controller="MatchedCorporateController" implements="flexipage:availableForRecordHome,force:hasRecordId" access="global" >

    <aura:attribute name="recordId" type="Id" />
    <aura:attribute name="Opportunity" type="Volunteer_Opportunity__c" />
    <aura:attribute name="support" type="Support__c" default="{!v.Opportunity.Support__c}"/>
    <aura:attribute name="corporateVolunteerSupports" type="Corporate_Volunteer_Support__c" />
    <aura:attribute name="Columns" type="List" />

    <aura:handler name="init" value="{!this}" action="{!c.myAction}" />

    <force:recordData aura:id="accountRecord"
                      recordId="{!v.recordId}"
                      targetFields="{!v.Opportunity}"
                      layoutType="FULL"
                      />

    <lightning:card iconName="standard:record" title="{! 'Matched Corporate Volunteers offering ' + v.support  }">
        <!-- Contact list goes here -->
        <lightning:datatable data="{! v.corporateVolunteerSupports }" columns="{! v.Columns }" hideCheckboxColumn="true"/> 

    </lightning:card>

</aura:component>

I follows a module called 'Quick Start: Lightning Components' in Trailhead and tried to adapt it to my code, so there are some things I don't use, such as the recordId.

Client-side Controller:

({
    myAction : function(component, event, helper) {
        component.set("v.Columns", [
            {label:"Name", fieldName:"Name", type:"text"}//,
        ]);

    var action = component.get("c.getContacts");
    action.setParams({
        support: component.get("v.support")
    });


    action.setCallback(this, function(data) {
        component.set("v.corporateVolunteerSupports", data.getReturnValue());
    });
    $A.enqueueAction(action); 

      }
})