i have a class in dev org with code is

name of class is ManageRules.cls

/**
* This class is used for creating and editing Rule
**/

public with sharing class ManageRules{
public Rule__c newrule {get;set;}
public String objType {get;set;}
public string SearchEvalRule {get;set;}
public string Descr {get;set;}
public List<SelectOption> objOptions {get;set;}
// public String descr {get;set;}
public boolean edit {get;set;}
String ruleId;

public ManageRules(Apexpages.StandardController stdcon){
ruleId = stdcon.getId();
newrule = new Rule__c();
objOptions = new List<SelectOption>();

edit=false;
/**
* Add standard Objects
*/
objOptions.add(new SelectOption('',''));
objOptions.add(new SelectOption('Account','Account'));
objOptions.add(new SelectOption('Contact','Contact'));
objOptions.add(new SelectOption('Opportunity','Opportunity'));
objOptions.add(new SelectOption('Case','Case'));
objOptions.add(new SelectOption('Lead','Lead'));
objOptions.add(new SelectOption('Campaign','Campaign'));
objOptions.add(new SelectOption('Quote','Quote'));
objOptions.add(new SelectOption('Product2','Product'));
//objOptions.add(new SelectOption('ForeCast','Forecast'));

Map<String, Schema.SObjectType> mapObj = Schema.getGlobalDescribe();
for(String objname:mapObj.keySet()){
Schema.SObjectType sobj = mapObj.get(objname);
Schema.DescribeSObjectResult descRes = sobj.getDescribe();
/**
* Add custom objects
*/
if(descRes.isCustom() && !descRes.isCustomSetting()){
String objLabel = descRes.getLabel();
objOptions.add(new SelectOption(objName,objLabel));
}
}

/* Edit Rule */
if(ruleId!=null){
edit=true;
newrule = [select name,object__c,Rule_Execution_Plan__c,Available__c,Evaluation_Rule__c,Description__c from rule__c where id=:ruleId];
if(newrule!=null){
objtype=newrule.object__c;
Descr =newrule.Description__c;
SearchEvalRule =newrule.Evaluation_Rule__c ;

}
}

}

Public List<SelectOption> getEvalRule() {

List<selectOption> options = new List<selectOption>();
options.add(new selectOption('', '- None -'));
Schema.DescribeFieldResult field = Rule__c.Evaluation_Rule__c.getDescribe();
for (Schema.Picklistentry picklistEntry : field.getPicklistValues())
{
options.add(new SelectOption(pickListEntry.getValue(),pickListEntry.getLabel()));
}
return options;

}
public PageReference saveRule(){
newrule.object__c = objtype;
newrule.Evaluation_Rule__c=SearchEvalRule;
newrule.Description__c= Descr;

try{
Database.upsert(newrule);
return(new PageReference('/'+newrule.id));
}
catch(Exception e){
ApexPages.Message msg = new ApexPages.Message(ApexPages.severity.Error,e.getDMLMessage(0));
ApexPages.addMessage(msg);
return null;
}

}

public PageReference saveAndNewRule(){
newrule.object__c = objtype;
newrule.Evaluation_Rule__c=SearchEvalRule;
newrule.Description__c= Descr;
edit=false;
try{
Database.upsert(newrule);
newrule = new Rule__c();
return(new PageReference('/apex/manageRules'));
}
catch(Exception e){
ApexPages.Message msg = new ApexPages.Message(ApexPages.severity.Error,e.getDMLMessage(0));
ApexPages.addMessage(msg);
return null;
}

}


}

i created an object its giving me error

Description Resource Path Location Type
Save error: Rule__c : managerules does not exist or is not a valid override for action Edit. Rule__c.object /RuleCriteria/src/objects line 0 Force.com save problem

my Rule__c object code segment is

<actionOverrides>
<actionName>Edit</actionName>
<content>ManageRules</content>
<skipRecordTypeSelect>false</skipRecordTypeSelect>
<type>Visualforce</type>
</actionOverrides>

i am unable to figure why its showing me this error its an existing project so i have to deploy it on my dev org .on others org its working perfectly fine.i first i remove actionOverride tag from object and save it to my org then i save class code it is also working fine and after that i add this code segment in my object code  and then try to save this object code and getting this error.can any one please how to resolve this issue??