# Adding positioner to a already existing system

**URL:** <https://tech-community.robotics.abb.com/t/adding-positioner-to-a-already-existing-system/6812>\
**Category:** Robot Controller\
**Created:** [September 22, 2015, 2:53pm UTC](https://tech-community.robotics.abb.com/t/adding-positioner-to-a-already-existing-system/6812 "2015-09-22T14:53:28Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![AnaHV](https://avatars.discourse-cdn.com/v4/letter/a/d9b06d/32.png) [@AnaHV](https://tech-community.robotics.abb.com/u/AnaHV)\
**Post date:** [September 22, 2015, 2:53pm UTC](https://tech-community.robotics.abb.com/t/adding-positioner-to-a-already-existing-system/6812/1 "2015-09-22T14:53:28Z")

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Hello,

I have a system, consisting in **only one robot** (real system). Now, we will **install a positioner** and **add to the system already existing**. I can add without problems the positioner, when I use a **virtual control**. This, using the license key file _ **extkey.kxt** _ of the positioner that I desire to adquire fond on MediaPool and add it using the **System Builder**. However, when I try to add on the **real control** (only in order to test on simulation mode) the **“The serie number is not correct or have mismatches with the robotware serie number”**. So, Is the license key file _ **extkey.kxt** _ on MediaPool like a **demo of the positioner** that is only applicable to virtual use? So, only when I have **the specific license key to that positioner** I can begin developing my new system. Is that right?