How can I make 'all' if it doesn't exist, since it's giving a fatal error?

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It depends on the context in which you are trying to use "all". If you are trying to use it as a variable or function, you will need to define it yourself or find a suitable implementation. If you are trying to use it as a language keyword or operator, it should already be defined and supported by your programming language or framework.

In any case, it is important to understand why you are receiving a fatal error and address the root cause before attempting to add or modify code.