A non-empty psr-4 prefix must end with a namespace separator.

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The error “a non-empty psr-4 prefix must end with a namespace separator” occurs when defining the PSR-4 autoloading in PHP and the namespace prefix is not properly formatted. In PSR-4, the namespace prefix should end with a namespace separator, which is a backslash (\).

For example, let’s say you have a project with the namespace prefix “MyProject” and you want to autoload classes from the “src” directory. The correct PSR-4 configuration would look something like this: 


    "autoload": {
        "psr-4": {
            "MyProject\\": "src/"
        }
    }

Notice how the namespace prefix “MyProject” ends with a backslash (\) in the PSR-4 configuration. This is necessary to comply with the PSR-4 autoloading standard.

On the other hand, if you omit the backslash at the end of the namespace prefix, you will encounter the mentioned error. For instance: 


    "autoload": {
        "psr-4": {
            "MyProject": "src/" // Missing the backslash (\) at the end of the namespace prefix
        }
    }

In this case, you will receive the error “a non-empty psr-4 prefix must end with a namespace separator” because the namespace prefix “MyProject” does not end with a backslash (\), violating the PSR-4 specification.

Always make sure to include the backslash (\) at the end of the namespace prefix when defining PSR-4 autoloading in PHP to avoid this error.

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