Top-level object must be a mapping

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Now, let’s explain the error “top-level object must be a mapping” in detail with an example:

In various programming languages such as YAML and Python, a mapping refers to a data structure that consists of key-value pairs. The error “top-level object must be a mapping” typically occurs when the structure of the data being parsed or processed should be a mapping, but it is not.

For instance, consider the YAML code below:

“`yaml
– apple
– banana
– orange
“`

In this example, the top-level object is a sequence (denoted by “-“), where “apple,” “banana,” and “orange” are individual elements within the sequence. However, the parser or processor expects the top-level object to be a mapping instead.

To resolve this error, we need to convert the sequence into a valid mapping structure. Here’s an example of corrected YAML code:

“`yaml
fruit:
– apple
– banana
– orange
“`

In this updated code, the top-level object is now a mapping where ‘fruit’ is the key, and the sequence of fruits is the corresponding value.

When working with different programming languages or tools, it’s essential to understand the expected data structure and ensure that your data conforms to that structure to avoid such errors.

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