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Hi @chin soon chong,

Please see this previous question and answer where model corruption is covered in detail:

https://answers.flexsim.com/questions/27522/my-model-wont-openmy-model-is-emptymy-model-crashe.html

As to your question "How do I repair the model", there is no perfect solution. In fact, sometimes the model is not recoverable. That must be determined on a case-by-case basis, however.

Your best defense against corruption is a good versioning strategy, with backups. Assuming that you don't have versioned back ups, you could try mitigation strategy #5 from the linked post to see if you could load your model as a tree node and copy parts out of it.

You may want to reply with your model attached so that we can look at it directly to see if anything can be done. If your model contains sensitive information, consider posting your model to a new private question (when creating the new question, check the box to make it private), in which case only FlexSim US would be able to see your question or download your model.