These are the errors that come up repeatedly and most are avoidable with a bit of planning:

• Expired documents at submission: Criminal record checks and medical certificates have a validity window of three months. If your appointment is delayed and documents expire, you'll need to obtain them again.
• Wrong consulate: Applying outside your provincial jurisdiction gets your application rejected before it's even reviewed.
• Missing apostille on one document: Consulates check every document. One missing apostille means the whole application is returned.
• Health insurance from a non-approved insurer: Canadian travel insurance policies do not meet the NLV or DNV health insurance requirement. The policy must be from a Spain-approved provider.
• Insufficient income documentation: Bank statements alone are often not enough. Consulates want to see the source of income like pension letters, dividend statements, employer payslips, not just a balance.
• Not booking the appointment early enough: This one is responsible for more missed timelines than all the document issues combined.
• Relying on outdated information: Spain's immigration rules like income thresholds, visa conditions, the Golden Visa real estate route, the Beckham Law, have all changed meaningfully in the last years. Guides written before 2023 give false information entirely. Always cross-check what you read.