Hafez, You need to remove all of the files that have the extension *.dll from the ..\Trnsys16\UserLib\ directory and place them into the ..\Trnsys16\UserLib\ReleaseDLLs directory. Kind regards, David hafez sayegh wrote: Dear Sir / Madam, -- *********************************************************************** Thermal Energy System Specialists (TESS), LLC David BRADLEY 2916 Marketplace Drive - Suite 104 Partner Madison, WI 53719 USA P: +1.608.274.2577 F: +1.608.278.1475 E-mail: bradley@tess-inc.com Web Pages: http://www.tess-inc.com and http://www.trnsys.com *********************************************************************** |