why is that???? : fetch FetchError: invalid json response body at http://95.179.236.23/V1/battlesruleset?ruleset=Silenced%20Summoners%7CTaking%20Sides&mana=26&player=GANG-JIAN-WANG&token=undefined&summoners=[167,440,178,437,156,224,441] reason: Unexpected token < in JSON at position 0

[Brmxj001]

API call: http://95.179.236.23/V1/battlesruleset?ruleset=Silenced%20Summoners%7CTaking%20Sides&mana=26&player=GANG-JIAN-WANG&token=undefined&summoners=[167,440,178,437,156,224,441]
fetch FetchError: invalid json response body at http://95.179.236.23/V1/battlesruleset?ruleset=Silenced%20Summoners%7CTaking%20Sides&mana=26&player=GANG-JIAN-WANG&token=undefined&summoners=[167,440,178,437,156,224,441] reason: Unexpected token < in JSON at position 0
at /Users/wangxiaobo/order/splinterlands/splinterlands-bot-master/node_modules/_node-fetch@2.6.7@node-fetch/lib/index.js:273:32
at processTicksAndRejections (internal/process/task_queues.js:93:5)
at async battlesFilterByManacap (/Users/wangxiaobo/order/splinterlands/splinterlands-bot-master/possibleTeams.js:99:21)
at async Object.possibleTeams (/Users/wangxiaobo/order/splinterlands/splinterlands-bot-master/possibleTeams.js:174:25)
at async startBotPlayMatch (/Users/wangxiaobo/order/splinterlands/splinterlands-bot-master/index.js:455:31)
at async run (/Users/wangxiaobo/order/splinterlands/splinterlands-bot-master/index.js:607:9)
at async startSingle (/Users/wangxiaobo/order/splinterlands/splinterlands-bot-master/main.js:83:5)
at async /Users/wangxiaobo/order/splinterlands/splinterlands-bot-master/main.js:93:9 {
type: 'invalid-json'
}