If an error on your vignette means you have not been issued with a BRP, you will need to report the problem immediately. This must be within three months of arriving in the UK, or before the expiry date on your vignette (whichever is sooner). It is extremely important to act promptly - an error on your vignette will impact both the documents you need to demonstrate your leave, and your ability to demonstrate the right to study on your programme. You will need to contact UKVI to report the error. Full details can be found on the gov.uk webpages.
If you are not sure how to report the error or have concerns, please visit our visa webpages.