<h3>Description</h3>
<p>I saw that the new version will require me to first close my open offers. So I tried to do this in the UI but got an error per the screenshot with only the text "Unable to close offer:" with no additional reason.</p>
<p>In the logs, I see:</p>
<pre><code>Nov-01 21:38:11.538 [JavaFX Application Thread] ERROR b.c.o.OpenOfferManager: Add offer to P2P network failed. Please update to the latest Bisq version. A mandatory update was released which disables trading for old versions. Please check out the Bisq Forum for more information. 
Nov-01 21:38:15.842 [JavaFX Application Thread] ERROR b.d.m.p.o.OpenOffersView: Remove offer failed 
</code></pre>
<h4>Version</h4>
<p>1.1.7</p>
<h3>Steps to reproduce</h3>
<p>I have an existing offer, and I am clicking the red "x" trash button to close the offer.</p>
<h3>Expected behaviour</h3>
<p>The offer should be closed.</p>
<h3>Actual behaviour</h3>
<p>I get an error message saying that "Remove offer failed: " with no explanation.</p>
<h3>Screenshots</h3>
<p><a target="_blank" rel="noopener noreferrer" href="https://user-images.githubusercontent.com/869094/68066143-4dda1800-fcf0-11e9-8d0d-a0ec625c7479.png"><img src="https://user-images.githubusercontent.com/869094/68066143-4dda1800-fcf0-11e9-8d0d-a0ec625c7479.png" alt="Screenshot from 2019-11-01 21-40-41" style="max-width:100%;"></a></p>
<h4>Device or machine</h4>
<p>Ubuntu 18.04.3 LTS</p>

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