How do I get RMARK to identify the correct number of occurrences in a PoissonMR model?

I have the latest version of RMARK and MARK installed on my computer and the example code from runs perfectly. However, when I try to run the code using mock data that I have created I get an output that has "Not a number" where the values of the estimate, se and the confidence intervals should be for alpha, sigma, U etc. Another error message I keep getting is " Number of unmarked seen values specified > number of occacsions." I am working with a data set that has 6 occasions and 67 individuals, but RMARK doesn't run when I list 6 occurrences in the "unmakred seen" etc. sections. This was a camera trap study, so every individual was considered "marked" once a picture of them was recorded, therefore I don't have any "unmakred" individuals and I also don't know the number of known individuals in the population. Every individual was identified.
This is my code,model="PoissonMR",
counts=list("Unmarked Seen"=c(0,0,0,0,0,0),
"Marked Unidentified"=c(0,0,0,0,0,0),
"Known Marks"=c(0,0,0,0,0,0)))
Does anyone know what might be causing this?
I've also attached my data as a csv.