What is the solution for the "mapping values are not allowed in this context" error in a YAML file?

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The "mapping values are not allowed in this context" error in a YAML file usually means that a mapping (key-value pair) has been improperly used in a context where it is not allowed.

To solve this error, you need to check the context in which the error occurs and make sure there are no mapping values present where they are not allowed. Here are some common reasons for this error and how to fix them:

1. YAML indentation: YAML is highly sensitive to indentation. Ensure that each key-value pair is properly indented. If a value is indented at the same level as a key, it will throw the error.

2. Improper use of colon: In YAML notation, a colon (:) separates the key from the value. In case of writing a plain string, you must enclose it in quotes otherwise you'll get a mapping value not allowed error.

3. Improper use of brackets: Sometimes using brackets, [], for lists can cause an issue in YAML. Ensure that lists are properly indented or nested without including premature/mapping values.

By resolving these issues, you should be successful in avoiding the mapping value not allowed error in your YAML file.