Downgrading Web Service Request Mgt. codeunit

clembo

I'm working on 2013 version. I need to call an external web service.
On 2015 version there is a code unit to solve this. So I decide to importo object in previous version.

I need:

CU1290 (missing in my version)
CU1291 (missing in my version)
CU1292 (missing in my version)
CU6224 (merge for missing code)

But when I try to compile 1291 code unit there was some error:

First of all Collect function

OuterException := GETLASTERROROBJECT;

In my version GETLASTERROROBJECT was missing.

Second in GetToType Function this code cause an error:

IF Type.Equals(Exception.GetType) THEN

"The call is ambiguous between the following method
'GetType()'
And
'GetType()'

There is a way to workaround this error an use new object?