Hi Francesca, Nicolette and John,
Please see the guidance at:
Self-employment (short) notes ensuring that the correct boxes have been ticked, no pence figure or commas have been included and resubmit.
If the error message continues to occur please complete the full self employment pages. You can do this by omitting to tick the box advising that your turnover is less than £85,000. Please then complete box 15 for your turnover (and if turnover remains below £85,000) then insert total expenses in Box 31.
If you still encounter error messages then please contact
Technical support with HMRC online services or
Self Assessment: general enquiries
Thank you.