Challenge Not yet complete... here's what's wrong: 
The 'SpeakerControllerExtension' Apex class was not found

although i have the class named this.
 

VF Page:
<apex:page controller="hb1" >
<apex:form >
<apex:pageBlock >
<apex:pageBlockButtons >
<apex:commandButton value="save" action="{!save}"/>
</apex:pageBlockButtons>
<apex:pageBlockSection >
<apex:inputField value="{!alsat.name}"/>
<apex:inputField value="{!alsat.Date_and_Time_of_allotment__c}"/>
<apex:inputField value="{!alsat.Hotels_Lodges__c}"/>
<apex:inputField value="{!alsat.Booking_Period__c}"/>
<apex:inputField value="{!alsat.Members__c}"/>
</apex:pageBlockSection>
</apex:pageBlock>
</apex:form>
</apex:page>

controller:
public class hb1 {
alloted_satsangi__C alsat;

public void setalsat(alloted_satsangi__C al){
alsat = new alloted_satsangi__C();
alsat.name = al.name;
alsat.Date_and_Time_of_allotment__c=al.Date_and_Time_of_allotment__c;
alsat.Hotels_Lodges__c=al.Hotels_Lodges__c;
alsat.Booking_Period__c=al.Booking_Period__c;
alsat.Members__c=al.Members__c;
}

public alloted_satsangi__C getalsat(){
return alsat;
}

public void save(){
insert alsat;}

}

The Issue In requesting SOAP API.Please resolve it

soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:sf="urn:fault.enterprise.soap.sforce.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   <soapenv:Body>
      <soapenv:Fault>
         <faultcode>sf:UNSUPPORTED_CLIENT</faultcode>
         <faultstring>UNSUPPORTED_CLIENT: TLS 1.0 has been disabled in this organization. Please use TLS 1.1 or higher when connecting to Salesforce using https.</faultstring>
         <detail>
            <sf:UnexpectedErrorFault xsi:type="sf:UnexpectedErrorFault">
               <sf:exceptionCode>UNSUPPORTED_CLIENT</sf:exceptionCode>
               <sf:exceptionMessage>TLS 1.0 has been disabled in this organization. Please use TLS 1.1 or higher when connecting to Salesforce using https.</sf:exceptionMessage>
            </sf:UnexpectedErrorFault>
         </detail>
      </soapenv:Fault>
   </soapenv:Body>
</soapenv:Envelope>

Challenge Not yet complete... here's what's wrong: 
The Apex test class 'AnimalLocatorTest' does not appear to be using the AnimalLocatorMock class correctly.

VF Page:
<apex:page controller="hb1" >
<apex:form >
<apex:pageBlock >
<apex:pageBlockButtons >
<apex:commandButton value="save" action="{!save}"/>
</apex:pageBlockButtons>
<apex:pageBlockSection >
<apex:inputField value="{!alsat.name}"/>
<apex:inputField value="{!alsat.Date_and_Time_of_allotment__c}"/>
<apex:inputField value="{!alsat.Hotels_Lodges__c}"/>
<apex:inputField value="{!alsat.Booking_Period__c}"/>
<apex:inputField value="{!alsat.Members__c}"/>
</apex:pageBlockSection>
</apex:pageBlock>
</apex:form>
</apex:page>

controller:
public class hb1 {
alloted_satsangi__C alsat;

public void setalsat(alloted_satsangi__C al){
alsat = new alloted_satsangi__C();
alsat.name = al.name;
alsat.Date_and_Time_of_allotment__c=al.Date_and_Time_of_allotment__c;
alsat.Hotels_Lodges__c=al.Hotels_Lodges__c;
alsat.Booking_Period__c=al.Booking_Period__c;
alsat.Members__c=al.Members__c;
}

public alloted_satsangi__C getalsat(){
return alsat;
}

public void save(){
insert alsat;}

}

Challenge Not yet complete... here's what's wrong: 
The Apex test class 'AnimalLocatorTest' does not appear to be using the AnimalLocatorMock class correctly.