Dear David, Thank you for your response. I’v gone through my equations but it seems that everything works well unless I call my m-file with type 155. I had a look at some toruials and I realized that the latest update Type155.dll in Trnsys 18 is for Matlab version 2017.b. As I use the latest version of Matlab (2018.b), apparently it is not compatible with Type155.dll. Do you have any solution for that ? Thanks Bests, Hamid Von: David BRADLEY [mailto:d.bradley@tess-inc.com] Hamidreza, That error does not look like it has anything to do with Type155; it is TRNSYS telling you that the equation name AA_H_0_0 has been referenced but has not been defined. kind regards, David On 02/21/2019 07:52, Hamidreza Esfehani via TRNSYS-users wrote:
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