微信小程序IM，初始化报错

这个是我推送初始化极光打印的数据
event:c_init, data:{"appkey":"2c1a6b8feb65a69f61709c1d","random_str":"gsjtbcseyawftfc78htxqytcacmjfscn","signature":"94A9C029FD5EA9204E0ED9E10DA9791D","timestamp":1562568758299,"fromPlatForm":"x","rid":780650346}
这个会报错
{"rid":780650346,"code":880102,"event":"c_init","message":"signatu fail，the key or md5 value is error"}
提示我的key或者md5错了，key我对比了没有错，md5我使用了网上的在线工具，对比了也没有问题，时间戳也是到毫秒的