UMI project (file) issue - geometry preview thread - affecting the Energy Simulation - disappeared .dat file

Dear Sir / Madam

Good day,

Hope you are doing well,

It is more than two years that I practice and work with UMI for my studies and researches, BUT nowadays I have faced a new issue that is very Strange and Unprecedented.

The issue is that: The same 3D models (UMI project files) that I used to do all types of simulations for (without facing any issue), Nowadays when I open them, after a few seconds, I get the below message:

umi: The geometry preview thread threw an unhandled exception. This is an internal error and should be reported as a bug. Use the UmiStartGeometryPreviewThread command to restart geometry previews.

This is while when I use the command "UmiStartGeometryPreviewThread", the same message is given over and over again.

(Note: I have not updated my Rhino, and the UMI version I use is the latest one [2.1] / I tried on another computer that UMI verison [umi_2.0xx.experimental] was installed on it and I got the same issue)

AFTER THAT

when I am trying to do the Energy simulation for a group of buildings, the process gets started, the "green bar" goes on and it finishes, and in above the command bar I see the "energy simulation complete"; BUT NO RESULTS -and obviously no color- are given to the buildings (either some OR all of them).

I checked a few line above, and I noticed the message:

umi energy error: Could not find file 'C:\Umi\Temp\umi-shoeboxer\My-Case-Study\My-Case-Study.dat'.

Can you please help me figure out what is the issue and How I can resolve it?

Thank you for your quick and helpful response in advance.

Best Regards;

Hossein

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In Short

Umi is a Rhino-based design environment for architects and urban planners interested in modeling the environmental performance of neighborhoods and cities with respect to operational and embodied energy use, walkability and daylighting potential. Since 2012, Umi has been  developed by the Sustainable Design Lab at the Massachusetts Institute of Technology with support from a National Science Foundation EFRI_SEED project, the MIT Energy Initiative, the Kuwait-MIT Center, the Center for Complex Engineering Systems (CCES) at KACST and MIT, Transsolar Climate Engineering and United Technologies Corporation. Further tool developed is now also being conducted at the Environmental Systems Lab at Cornell University.

A first public version of Umi was released during a public symposium on Sustainable Urban Design on May 6th 2013 at the Massachusetts Institute of Technology. Version 2.0, which also includes an embodied energy module, was released on November 7th 2014.

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