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Why can't I add the Assiged To field in Task to my visualforce page?

I am trying to override the edit page for "Log a Call" or task with a custom visualforce page. I am having trouble getting some of the fields like
Assigned To,
Related To and
the checkbox "Send Notification Email".
I was able to add other fields uisng the API names.
Appreciate if anyone can help with the right way to adding the above fields in VF page.

When I add the following for the Assigned To, it throws the error "Assigned To ID: owner cannot be blank". Basiaclly I want to display the Assigned To field as it appears in the standard Log a Call edit page. Is there some reference available somewhere for converting all these fields in the standard page into a VF page?
VF Code:
<apex:page standardController="Task" extensions="conTaskNew">
<apex:form >
<apex:pageBlock id="mypageblock" title="Task Edit" mode="new">

<apex:pageBlockButtons >
<apex:commandButton onclick="return lsave()" action="{!save}" value="Save"/>
<apex:pageBlockSection title="Task Information" columns="2" id="theSection">
<apex:inputField id="vOwner" value="{!task.OwnerId}"/>
<apex:inputField id="vActDate" value="{!task.ActivityDate}"/>
<apex:inputField id="vsubject" value="{!task.Subject}"/>

 Appreciate all your valuable feedbacks.
Bhawani SharmaBhawani Sharma
I wrote this code and it worked perfectly fine for me.
<apex:page standardController="Task">
<apex:commandButton value="Save" action="{!save}"/>
<apex:inputField value="{!Task.OwnerId}"/>
<apex:inputField value="{!Task.Subject}"/>

Make sure, you are not setting Null as ownerId in anywhere in your code.