Kamal,<br><br>I had a same problem, when running newer version of WRF with old version namelist file.<br>Just do what error said (bold):<br><br><br><div class="gmail_quote">
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Error while reading namelist physics<br>
<b> Is ucmcall still in your physics namelist?</b><br>
-------------- FATAL CALLED ---------------<br>
FATAL CALLED FROM FILE: <stdin> LINE: 12531<br><b>
Replace it with sf_urban_physics</b><br><br></blockquote><div><br></div></div>Hope it is helpful, <br>Regards,<br><br>Goran Gasparac<br>