{
"message": "channelIndex is required, query must contain at least one of [index, sequence]",
"code": "ValidationError",
"asdf": "this is error handler in app"
}
{get} /lesson/v2/channel
{
"message": [
"channelIndex is required",
"query must contain at least one of [index, sequence]"
],
"code": "ValidationError",
"asdf": "this is error handler in app"
}
{get} /lesson/v3/channel
{
"message": "channelIndex is required, query must contain at least one of [index, sequence]",
"code": "ValidationError",
"asdf": "this is error handler in api"
}