klingai-common-errors

Diagnose and fix common Kling AI API errors. Use when troubleshooting failed video generation or API issues. Trigger with phrases like 'kling ai error', 'klingai not working', 'fix klingai', 'klingai failed'.

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Kling AI Common Errors

Overview

Complete error reference for the Kling AI API. Covers HTTP status codes, task-level failures, JWT issues, and generation-specific problems with tested solutions.

HTTP Error Codes

Code	Error	Cause	Solution
`400`	Bad Request	Invalid parameters, malformed JSON	Validate all required fields; check `model_name` is valid
`401`	Unauthorized	Invalid/expired JWT token	Regenerate JWT; verify AK/SK; check `exp` claim
`402`	Payment Required	Insufficient credits	Top up API resource pack or subscription
`403`	Forbidden	Content policy violation or API disabled	Review prompt against content policy; enable API access
`404`	Not Found	Invalid task_id or wrong endpoint	Verify task_id; check endpoint path spelling
`429`	Too Many Requests	Rate limit exceeded	Implement exponential backoff (see pattern below)
`500`	Internal Server Error	Kling platform issue	Retry after 30s; if persistent, check status page
`502`	Bad Gateway	Upstream service unavailable	Retry with backoff; typically transient
`503`	Service Unavailable	System maintenance	Wait and retry; check announcements

Task-Level Failures

When HTTP returns 200 but task_status is "failed":

`task_status_msg`	Cause	Solution
Content policy violation	Prompt contains restricted content	Remove violent, adult, or copyrighted references
Image quality too low	Source image is blurry or too small	Use image >= 300x300px, clear and sharp
Prompt too complex	Too many scene elements	Simplify to 1-2 subjects, clear action
Generation timeout	Internal processing exceeded limit	Retry; reduce duration from 10s to 5s
Invalid image format	Unsupported file type	Use JPG, PNG, or WebP
Mask dimension mismatch	Mask size differs from source	Ensure mask matches source image dimensions exactly

JWT Authentication Errors

Problem: `401` on every request

# WRONG — missing headers parameter
token = jwt.encode(payload, sk, algorithm="HS256")

# CORRECT — include explicit headers
token = jwt.encode(payload, sk, algorithm="HS256",
                   headers={"alg": "HS256", "typ": "JWT"})

Problem: Token works then fails after 30 min

# WRONG — token generated once at import time
TOKEN = generate_token()

# CORRECT — refresh before expiry
class TokenManager:
    def __init__(self, ak, sk):
        self.ak, self.sk = ak, sk
        self._token = None
        self._exp = 0

    @property
    def token(self):
        if time.time() >= self._exp - 300:  # 5 min buffer
            payload = {"iss": self.ak, "exp": int(time.time()) + 1800,
                       "nbf": int(time.time()) - 5}
            self._token = jwt.encode(payload, self.sk, algorithm="HS256",
                                     headers={"alg": "HS256", "typ": "JWT"})
            self._exp = int(time.time()) + 1800
        return self._token

Rate Limit Handling

import time
import requests

def request_with_backoff(method, url, headers, json=None, max_retries=5):
    """Retry with exponential backoff on 429 and 5xx errors."""
    for attempt in range(max_retries):
        response = method(url, headers=headers, json=json)

        if response.status_code == 429:
            retry_after = int(response.headers.get("Retry-After", 2 ** attempt))
            print(f"Rate limited. Retrying in {retry_after}s...")
            time.sleep(retry_after)
            continue
        elif response.status_code >= 500:
            wait = 2 ** attempt
            print(f"Server error {response.status_code}. Retrying in {wait}s...")
            time.sleep(wait)
            continue

        response.raise_for_status()
        return response

    raise RuntimeError(f"Max retries ({max_retries}) exceeded")

Diagnostic Checklist

When a generation fails, check in order:

Auth valid? — Test with a simple GET request first
Credits available? — Check balance in developer console
Model valid? — Verify model_name matches catalog exactly
Parameters valid? — duration must be "5" or "10" (string, not int)
Prompt clean? — Remove special characters, keep under 2500 chars
Image accessible? — For I2V, verify image URL is publicly accessible
Feature exclusivity? — image_tail, dynamic_masks, and camera_control are mutually exclusive

Debug Logging

import logging

logging.basicConfig(level=logging.DEBUG)
logger = logging.getLogger("kling")

def debug_request(method, url, headers, json=None):
    """Log request/response for debugging."""
    logger.debug(f"→ {method.__name__.upper()} {url}")
    logger.debug(f"→ Body: {json}")
    r = method(url, headers=headers, json=json)
    logger.debug(f"← Status: {r.status_code}")
    logger.debug(f"← Body: {r.text[:500]}")
    return r

Resources

Repository: jeremylongshore/claude-code-plugins-plus-skills
Commit: 3a2d27d

Last updated: 5 days ago
Created: 5 days ago

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