Errors

WowData™ raises instructional WowDataUserError exceptions.

Each error has:

• a stable code (for recognition and automation)
• a clear message
• a remediation hint

Example:

[E_SOURCE_NOT_FOUND] Source file not found: 'missing.csv'.
Hint: Check the path, working directory, and filename.

High-frequency codes

• E_SOURCE_NOT_FOUND: source file missing
• E_SINK_DIR_NOT_FOUND: output directory missing
• E_CAST_ON_ERROR: invalid cast error policy
• E_FILTER_PARSE: invalid filter expression
• E_JOIN_PARAMS: missing/invalid join keys or right descriptor
• E_YAML_PARSE: invalid YAML syntax
• E_PIPELINE_ORDER: transform appears after sink

For full code/message coverage, see tests in wowdata/tests/ and compact table in REFERENCE.md.