AnyLogic error "Invalid Project File Format"

Question

When trying to open my model, I'm getting the error message "Invalid Project File Format" the file format is .alp. I don't think this is the reason, I saw here (https://www.researchgate.net/post/Anylogic_problem_of_alp_extension_it_says_invalid_file_format) that the reason is copying and pasting a parameter, and yes I did that I copied a parameter in the main and pasted then changed its name. This problem can be solved, or should I not try?

Answer 1

I have encountered this error before. When I brought it up with AnyLogic support, this is the advice I received:

The error indicates that the model was corrupted. If you open the .alp file in any text editor, you can see that some part of content is missing.

There might be a backup file in the folder with the model. It is named like <model_name>.alp.bak. You need to remove ".bak" characters from the file name to recover the model.

Note that .bak files are hidden by default. Follow these steps to see a .bak file in the model folder:

1. Open Folder Options by clicking the Start button > Control Panel > Appearance and Personalization, and then clicking Folder Options.
2. Click the View tab.
3. Under Advanced settings, click Show hidden files and folders, and then click OK.