Dynamic Pageblocktable to display header in column in apex:repeat tag

Apex Class

public  class competitorEntryController {        
        private String Oppid;
        public oppwrapper parentrec{get;set;}
        public List<oppwrapper> opplist{get;set;}
        public competitorEntryController(Apexpages.standardcontroller controller){
			Oppid=(string)controller.getrecord().get('Id');
			parentrec=new oppwrapper();
			for(Opportunity opp:[select id,name,(select id,name,name__c,Stage__c,NextStep__c from Competitors__r order by name),Stagename,
								nextstep from Opportunity where id=:Oppid]){
				parentrec.opp=opp;
				if(opp.Competitors__r.size()>0){
					List<CompetitorWrapper> temp=new List<CompetitorWrapper> ();
					for(Competitor__c cm:opp.Competitors__r){
							competitorWrapper cw=new competitorWrapper();
							cw.comp=cm;
							temp.add(cw);
					}
					parentrec.complist=temp;
				}
			}
			opplist=new List<oppwrapper> ();
			system.debug('*******parentrec.complist:'+parentrec.complist);
			opplist.add(parentrec);
        }
        
        public PageReference Submit(){
            //update operation on opportunity and competitor records
			Pagereference pag=new PageReference('/'+Oppid);
            return pag;
        }
        public Component.Apex.PageBlockTable getMyPageBlockTable(){
			Component.Apex.PageBlockTable  table=new Component.Apex.PageBlockTable(var='op');
			table.expressions.value='{!opplist}';
			if(opplist.size()>0){
				Component.Apex.pageblocksection pgblksec1 = new Component.Apex.pageblocksection ();
				pgblksec1.columns=1;
				Component.Apex.inputField inputField1 = new Component.Apex.inputField (); 
				inputField1 .expressions.value = '{!op.opp.stagename}';
				pgblksec1.childComponents.add(inputField1);
				Component.Apex.inputField inputField2 = new Component.Apex.inputField ();
				inputField2.expressions.value = '{!op.opp.nextstep}';
				pgblksec1.childComponents.add(inputField2);
				Component.Apex.Column column = new Component.Apex.Column(headerValue=opplist[0].opp.name);
				column.childComponents.add(pgblksec1);
				table.childComponents.add(column);
				if(opplist[0].complist.size()>0){
					integer count=0;
					for(competitorWrapper comp:opplist[0].complist){
						Component.Apex.pageblocksection pgblksec2 = new Component.Apex.pageblocksection ();
						pgblksec2.columns=1;
						Component.Apex.inputField inputField3 = new Component.Apex.inputField ();
						inputField3.expressions.value = '{!op.complist['+count+'].comp.Stage__c}';
						pgblksec2.childComponents.add(inputField3 );
						Component.Apex.inputField inputField4 = new Component.Apex.inputField ();
						inputField4.expressions.value = '{!op.complist['+count+'].comp.nextStep__c}';
						pgblksec2.childComponents.add(inputField4 );
						Component.Apex.Column column1 = new Component.Apex.Column(headerValue='Competitor:'+opplist[0].complist[count].comp.name);
						column1.childComponents.add(pgblksec2);
						table.childComponents.add(column1);
						count++;
					}
				}               
			}
        return table;
    }
    public class oppwrapper{
		public opportunity opp{get;set;}
		public List<CompetitorWrapper> complist{get;set;}
		public oppwrapper(){
				complist=new List<CompetitorWrapper>();
		}
    }
	public class competitorWrapper{
		public Competitor__c comp{get;set;}
	}
        
}        
   

Visualforce Page

<apex:page standardController="Opportunity" extensions="competitorEntryController">
<apex:form >
    <apex:pageblock title="Competitor section">
        <apex:pageblockButtons >
            <apex:commandButton value="Save" Action="{!Submit}"/>
        </apex:pageblockButtons>
        <apex:pageblockSection columns="1" title="Pageblocktable using dynamic visualforce components from Apex">
            <apex:dynamicComponent componentValue="{!MyPageBlockTable}"  invokeAfterAction="true"/>
        </apex:pageblockSection>
    </apex:pageblock>
</apex:form>
</apex:page>

Error: Compile Error: Didn't understand relationship 'Competitors__r' in FROM part of query call. If you are attempting to use a custom relationship, be sure to append the '__r' after the custom relationship name. Please reference your WSDL or the describe call for the appropriate names. at line 8 column 33