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Error message: Main project is not an existing folder

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When trying to open the aimms file I get the Error message: Main project is not an existing folder. It is from a Zipfile, normal Folder works. Indentical files. What is the error here? 

Best answer by MarcelRoelofs

What happens if you open a file directly from a zipfile, is that Windows will unpack that file to a temporary location and will open that file. When AIMMS opens such a temporarily unpacked .aimms file, it also wants to open additional files from the MainProject folder. These are not unpacked by Windows, however, hence opening an AIMMS project directly from a zip file will fail. 

So, I think the error here is that direct access to zip files in Windows Explorer give a false sense that all files in the zip file will be directly accessible, which they are not, unless you unpack the zip file. 

 

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3 replies

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I get the error, if I send the zipfile and open the AIMMS File which weirdly has only 1 KB, the main project doesn’t exist… please help me solve this hell task  

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AIMMS Partner
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  • Imke
  • AIMMS Partner
  • 3 replies
  • April 11, 2022

I get the same error if I try to open an .aimms file in a compressed folder. I think the problem is that you should first unpack the folder again before you can open the model.

MarcelRoelofs
AIMMSian
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  • MarcelRoelofs
  • AIMMSian
  • 106 replies
  • Answer
  • April 11, 2022

What happens if you open a file directly from a zipfile, is that Windows will unpack that file to a temporary location and will open that file. When AIMMS opens such a temporarily unpacked .aimms file, it also wants to open additional files from the MainProject folder. These are not unpacked by Windows, however, hence opening an AIMMS project directly from a zip file will fail. 

So, I think the error here is that direct access to zip files in Windows Explorer give a false sense that all files in the zip file will be directly accessible, which they are not, unless you unpack the zip file. 

 

Marcel Roelofs - AIMMS Product Portfolio Architect

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