In my ReactJs application, I am encountering an error indicating that the handler is not a function while attempting to send an array of loader functions to my route.

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There could be several reasons why you may be encountering this error. Here are a few possible solutions that you can try:

1. Check that the handler is indeed a function: Ensure that the handler (i.e., the function that will be executed when the route matches) is indeed a function. You can try logging the handler to the console to confirm that it's a function.

2. Check that the array of loader functions is valid: Make sure that the array of loader functions that you're trying to pass as a parameter is valid. You can try logging it to the console to confirm that it's an array and that each element is a function.

3. Bind the handler to the correct context: If you're passing a method as the handler (i.e., a function that is a property of a component), you may need to bind it to the correct context to ensure that this is set correctly when the function is invoked. You can do this by using the bind method or the ES6 arrow function syntax.

4. Wrap the handler in a function: If you're passing a method as the handler and you're still encountering the error, you may need to wrap it in another function to ensure that it's executed correctly. For example, you can define a separate function that calls the method and pass that as the handler instead.

5. Ensure that the handler is passed correctly: Double-check that you're passing the correct function as the handler to the routing library. It's possible that you're passing the wrong function or that there's a typo in the function name.

Hopefully, one of these solutions will help you resolve the error.