I can't query a custom formula field in the product2 object. I don't get an error when I put it in the SOQL SELECT statement, but I can't select it. I can select it from the Excel Connector, so it must be possible. Code:

$query_all_products = "select Id, ProductCode, Quantity__c, Warehouse_Location__c, WeightOunces__c, Shipping_Weight_Formula__c from product2";
$result = $sforce->query(array("queryString" => $query_all_products));
$all_products=$result->result->records;
echo '<pre>'.print_r($all_products,true).'</pre>';

Warehouse_Location__c

doesn't show up in the resulting object.And when I try using describeSObject:

$contact= $sforce->describeSObject("Contact");
print_r($contact);

I get this error: Fatal error: Uncaught SoapFault exception: [sf:INVALID_TYPE] INVALID_TYPE: sObject type cannot be null in (filename):3 Stack trace: #0 [internal function]: SoapClient->__call('describeSObject', Array) #1 (filename)(3): SoapClient->describeSObject('Contact') #2 {main} thrown in (filename) on line 3 Any ideas?