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The Type error message "mongoose.model is not a function" typically appears when there is an issue with how Mongoose is being used in the code. One possible cause is that the Mongoose module is not properly imported or required before trying to use the "model" function. Another possible cause is that the connection to the MongoDB database has not been established properly. It is also possible that there is a syntax error in the code, preventing the "model" function from being called correctly.