PYTHON x Troubleshooting Matrix

Matrix includes 64 runtime-specific guides grouped by user intent and fix patterns.

Guides in matrix: 64 | Sample shown: 40
#GuideInternal LinksIntent
1yaml.parser.ParserError: while parsing a block mapping: what it means and how to fix it83troubleshooting
2yaml.reader.ReaderError: unacceptable character #x0000: what it means and how to fix it73troubleshooting
3yaml.scanner.ScannerError: while scanning a simple key: what it means and how to fix it65troubleshooting
4yaml.composer.ComposerError: found duplicate key: what it means and how to fix it62troubleshooting
5yaml.scanner.ScannerError: found character '\t' that cannot start any token: what it means and how to fix it54troubleshooting
6JSONDecodeError: Invalid \escape: line 1 column 10 (char 9): what it means and how to fix it52troubleshooting
7yaml.scanner.ScannerError: mapping values are not allowed here: what it means and how to fix it52troubleshooting
8json.decoder.JSONDecodeError: Invalid \uXXXX escape: line 1 column 10 (char 9): what it means and how to fix it49troubleshooting
9yaml.parser.ParserError: expected , but found '': what it means and how to fix it41troubleshooting
10JSONDecodeError: Invalid \uXXXX escape: line 1 column 10 (char 9): what it means and how to fix it39troubleshooting
11json.decoder.JSONDecodeError: Unterminated string starting at: line 1 column 10 (char 9): what it means and how to fix it34troubleshooting
12json.decoder.JSONDecodeError: Expecting ':' delimiter: line 1 column 10 (char 9): what it means and how to fix it31troubleshooting
13json.decoder.JSONDecodeError: Invalid \escape: line 1 column 10 (char 9): what it means and how to fix it30troubleshooting
14JSONDecodeError: Unterminated string starting at: line 1 column 10 (char 9): what it means and how to fix it29troubleshooting
15simplejson.errors.JSONDecodeError: Invalid \uXXXX escape: line 1 column 10 (char 9): what it means and how to fix it29troubleshooting
16_csv.Error: line contains NUL: what it means and how to fix it28troubleshooting
17simplejson.errors.JSONDecodeError: Unterminated string starting at: line 1 column 10 (char 9): what it means and how to fix it25troubleshooting
18ValueError: invalid % escape: what it means and how to fix it25troubleshooting
19simplejson.errors.JSONDecodeError: Invalid \escape: line 1 column 10 (char 9): what it means and how to fix it22troubleshooting
20JSONDecodeError: Expecting ':' delimiter: line 1 column 10 (char 9): what it means and how to fix it22troubleshooting
21TypeError: the JSON object must be str, bytes or bytearray, not bool: what it means and how to fix it21troubleshooting
22TypeError: the JSON object must be str, bytes or bytearray, not list: what it means and how to fix it21troubleshooting
23json.decoder.JSONDecodeError: Invalid control character at: line 1 column 10 (char 9): what it means and how to fix it21troubleshooting
24TypeError: the JSON object must be str, bytes or bytearray, not int: what it means and how to fix it21troubleshooting
25TypeError: the JSON object must be str, bytes or bytearray, not dict: what it means and how to fix it21troubleshooting
26JSONDecodeError: Expecting value: line 1 column 1 (char 0): what it means and how to fix it20troubleshooting
27json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1): what it means and how to fix it20troubleshooting
28JSONDecodeError: Extra data: line 1 column 2 (char 1): what it means and how to fix it20troubleshooting
29JSONDecodeError: Expecting ',' delimiter: line 1 column 2 (char 1): what it means and how to fix it20troubleshooting
30JSONDecodeError: Invalid control character at: line 1 column 10 (char 9): what it means and how to fix it20troubleshooting
31_csv.Error: newline inside string: what it means and how to fix it20troubleshooting
32binascii.Error: Invalid base64-encoded string: number of data characters cannot be 1 more than a multiple of 4: what it means and how to fix it20troubleshooting
33xml.parsers.expat.ExpatError: undefined entity: line 1, column 10: what it means and how to fix it19troubleshooting
34xml.etree.ElementTree.ParseError: not well-formed (invalid token): line 1, column 0: what it means and how to fix it19troubleshooting
35JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1): what it means and how to fix it19troubleshooting
36_csv.Error: field larger than field limit (131072): what it means and how to fix it19troubleshooting
37simplejson.errors.JSONDecodeError: Expecting ':' delimiter: line 1 column 10 (char 9): what it means and how to fix it19troubleshooting
38simplejson.errors.JSONDecodeError: Invalid control character at: line 1 column 10 (char 9): what it means and how to fix it18troubleshooting
39simplejson.errors.JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1): what it means and how to fix it18troubleshooting
40yaml.constructor.ConstructorError: could not determine a constructor for the tag: what it means and how to fix it17troubleshooting

Quick fix checklist

  • Reproduce the error on a minimal input.
  • Check type/format and field mapping.
  • Apply the smallest safe fix.
  • Validate on production-like payload.