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The ReferenceError: require is not defined error occurs if the JavaScript require method is used but is not available in the current context.

The Python IndexError: string index out of range error occurs when an index is attempted to be accessed in a string that is outside its range.

The JavaScript ReferenceError: $ is not defined occurs when the jQuery library is used but is not properly loaded or is not available in the current scope of the code. In JavaScript, the $ symbol is often used as a shorthand alias for the jQuery library. This error indicates that the code is trying to use jQuery functionality by referencing the $ symbol, but the library is not available or has not been loaded correctly.

As Java has evolved over the years, multiple attempts have been made to simplify development for various use cases. From official standards like Java Enterprise Edition, to community-driven frameworks, Java is continuing to prove itself to be adaptable and viable. Our top list is based on usage from Hotframework.com's Java ranking and several other sources including blog posts and GitHub download numbers.

Using Rollbar is great for Exceptions both handled and unhandled. But there is so much more you can get out of a solution like Rollbar. We often hear users asking us to log structured log data to Rollbar or that they have a custom JSon object that they would like to store in Rollbar. If you just send in the Json object using Rollbar.Info(YOUROBJECT) you will find that it is placed in the message body as a string. This is fine but we can do a lot better.

The Python TypeError: unhashable type: 'dict' usually occurs when trying to hash a dictionary, which is an unhashable object. For example, using a dictionary as a key in another dictionary will cause this error. This is because dictionaries only accept hashable data types as a key. Only immutable objects such as strings, integers and tuples are hashable since they have a single unique value that never changes.

The Python TypeError: 'int' object is not iterable is an exception that occurs when trying to loop through an integer value. In Python, looping through an object requires the object to be “iterable”. Since integers are not iterable objects, looping over an integer raises the TypeError: 'int' object is not iterable exception.

An intuitive user interface is a hallmark of any decent business. But in order for the frontend of applications to work smoothly, you must also consider the backend. Backend development, also called server-side development, handles the behind-the-scenes functions of web development – things like interactions with databases, authorizing users and routing URLs.

There are several types of errors that can occur in Python. Each type indicates a different kind of problem in the code, and comprehending these error types is crucial in creating effective Python applications. The most common types of errors you'll encounter in Python are syntax errors, runtime errors, logical errors, name errors, type errors, index errors, and attribute errors. Let's go through each with examples.