Option Chain api is not working

I am trying to fetch option using this URL in Javascript - https://tradeapi.samco.in/option/optionChain?exchange=NFO&searchSymbolName=NIFTY&strikePrice=24600&optionType=CE&expiryDate=2024-08-29

I am getting different errors in different in different instances, I am not what is going on wrong.

{
“serverTime”: “24/08/24 11:46:59”,
“msgId”: “e7d238c5-2574-4c60-9889-c655d7c29726”,
“status”: “Failure”,
“statusMessage”: “TypeError: Cannot read properties of undefined (reading ‘LAST_PRICE’)\n at Object.fn (/home/samco/Middleware/TRADEAPI-MIDDLEWARE-NODEJS/api/controllers/option/option-chain.js:124:56)\n at process.processTicksAndRejections (node:internal/process/task_queues:95:5)”
}

above error seems to be an API issue. Is Samco API not consistent?

Another error that I am getting for the same request URL is, “Error Code 429 - Too Many requests”. How can it be too many error when I am just making one singe API call.