Sage Accounting Canada

I am new to Sage and I have been trying to create contact. I was able to create contacts via my .Net application but suddenly for 2 days, the API has been returning this error: [{"$severity":"error","$dataCode":"UnexpectedError","$message":"An unexpected…

Hello, I need to enter the existing information of my company in Sage, the company has 2 years of paperwork and I want to enter the invoices and expenses in Sage, do I need to do any special steps for this? Its a small business. Thanks