Google DocsAI Trainning failure

I have Google Contract DocsAI, added 20 Documents (10 test/ 10 train) labeled all the locations, but unfortunately when "Train new version" is executed using "Train from scratch" option we get error

],
"documentErrorCount": 294,
"datasetErrorCount": 159
}
},
"error": {
"code": 3,
"message": "Invalid dataset. See operation metadata for specific errors.",
"details": [
{
"@type": "type.googleapis.com/google.rpc.DebugInfo",
"detail": "generic::invalid_argument: Invalid dataset. See operation metadata for specific errors. [google.rpc.error_details_ext] { message: \"Invalid dataset. See operation metadata for specific errors.\" details { [type.googleapis.com/google.rpc.ErrorInfo] { reason: \"INVALID_DATASET\" domain: \"documentai.googleapis.com\" } } }"
},
{
"@type": "type.googleapis.com/google.rpc.DebugInfo",
"detail": "Debug the training operation at go/dai-debug:training?p=PROJECT_NUMBER:440479990132&p=OPERATION_ID:9188549943694453896"
}
]
}