Could not parse YAML configuration file [S-6602]
This error occurs when Stack is unable to parse a YAML configuration file, which could be a project-level
stack.yaml file or a global
config.yaml file. The error covers the following situations:
- The specified configuration file does not exist
- The configuration file is not well-formed YAML
- The file is well-formed YAML but does not match the expected data schema
The expected file formats are described in the Stack documentation.
Stack does not accept empty YAML files
When run with an empty YAML file, Stack fails to parse it. For example,
stack --stack-yaml empty.yaml build results in the error:
Error: [S-6602] Stack could not load and parse /PATH/TO/empty.yaml as a YAML configuraton file. While loading and parsing, Stack encountered the following exception: Aeson exception: Error in $: parsing ProjectAndConfigMonoid failed, expected Object, but encountered Null For help about the content of Stack's YAML configuration files, see (for the most recent release of Stack) http://docs.haskellstack.org/en/stable/yaml_configuration/.
This error in a project-level
stack.yaml file can be fixed by specifying a resolver, which is the minimal
Not a YAML file
stack.yaml file is not syntactically valid YAML. The error that results from
stack --stack-yaml not.yaml build is:
Error: [S-6602] Stack could not load and parse /PATH/TO/not.yaml as a YAML configuraton file. While loading and parsing, Stack encountered the following exception: YAML parse exception at line 0, column 0, while parsing a block node: did not find expected node content For help about the content of Stack's YAML configuration files, see (for the most recent release of Stack) http://docs.haskellstack.org/en/stable/yaml_configuration/.