Hmm, this table doesn't look like it comes from the same dataset you linked to in COMPLETEOKOK.
In the linked dataset the variable column values have names that start with word_read and send_read, etc. and so LECTM and LECTPH are associated with different variable groups. You must have edited this at some point?
Can you give a small example of the dataset you are using for the analysis? It can help folks help you if you paste in a small reproducible example into your question rather than linking to a large dataset that has to be read in remotely.
If you've never made a reproducible example before (i.e., reprex), you can get some ideas here:
My last thought is that if ezANOVA() fits a repeated measures ANOVA and not a mixed model you can have problems with unbalanced designs. I don't know if this is related to the error message or not, but you can read more about instances where repeated measures ANOVA doesn't work well here.