Model building at SageMaker Canvas has failed

Hi! I am a beginner on this platform. I am predicting something with time-series forecasting. After everything's set up, at 'Analyze' tab I troubled on building the model. I got this notif:

An error occurred (ValidationException) when calling the CreateDataset operation: 2 validation errors detected: Value 'Area Desc' at 'schema.attributes.2.member.attributeName' failed to satisfy constraint: Member must satisfy regular expression pattern: ^[a-zA-Z][a-zA-Z0-9_]; Value 'Brand Desc' at 'schema.attributes.3.member.attributeName' failed to satisfy constraint: Member must satisfy regular expression pattern: ^[a-zA-Z][a-zA-Z0-9_]

What should I do? Thank you in advance