<div dir="ltr"><p class="MsoNormal" style="margin-bottom:0.0001pt"><i><span style="font-size:14pt;font-family:Arial,sans-serif;color:black">Hello,</span></i></p>

<p class="MsoNormal" style="margin-bottom:0.0001pt"><span style="font-size:14pt;font-family:Arial,sans-serif;color:black"> </span></p>

<p class="MsoNormal" style="margin-bottom:0.0001pt"><i><span style="font-size:14pt;font-family:Arial,sans-serif;color:black"> In my project
TRNSYS version 17, when I run the calculation, I get an error that I cannot
fix:</span></i></p>

<p class="MsoNormal" style="margin-bottom:0.0001pt"><i><span style="font-size:14pt;font-family:Arial,sans-serif;color:black">******Fatal Error at time: 0.000000 Generated by Unit:
56Generated by Type: 56 Message: Error in automatic calculation for heat
transfer surface 0 or its adjacent surface!: Automatic heat transfer
calculation Is Only  Allowed on surfaces
Within a zone. Please check building input file (.  bui)!*</span></i><span style="font-size:14pt;font-family:Arial,sans-serif;color:black"></span></p>

<p class="MsoNormal" style="margin-bottom:0.0001pt"><i><span style="font-size:14pt;font-family:Arial,sans-serif;color:black"> </span></i></p>

<p class="MsoNormal" style="margin-bottom:0.0001pt"><i><span style="font-size:14pt;font-family:Arial,sans-serif;color:black">enclosed my project </span></i><span style="font-size:14pt;font-family:Arial,sans-serif;color:black"></span></p></div>