I’m doing a bot that gives order to buy or sell coins (in MEXC) but I have a problem with giving orders.

I tried this code

import ccxt

api_key = KEY
secret = SECRET

exchange = ccxt.mexc({
    'apiKey': api_key,
    'secret': secret,
    'options': {
        'createMarketBuyOrderRequiresPrice': False,
    }
})

symbol = 'LBTCUSDT'
amount_in_usd = 10


ticker = exchange.fetch_ticker(symbol)
current_price = ticker['last']

amount_in_btc = amount_in_usd / current_price

order = exchange.create_order(symbol, 'market', 'buy', amount_in_btc)

print(order)

but it gives ccxt.base.errors.InsufficientFunds: mexc {"msg":"Insufficient position","code":30004} error.