When trying to export your Key Stage 1 (KS1) assessment marks as a CTF, you ay get an error that states: No students have taken this assessment in the current academic year.
This appears when you've not input the marks into the correct assessment template.
It's likely you will have entered marks into the marksheets for Test Result assessments. These are used to record raw scores and marks that are used to make the teacher judgements, and are optional.
The assessments you are required to fill out, the ones exported in CTFs, are the Teacher Assessments. You'll need to set up and add marks to these assessments to be able to export the right grades in the CTF: Setting up and inputting marks into End of Key Stage 1 (KS1) DfE standardised Teacher Assessments