What does " invalid slots " mean?

#1

Here is my script

EXT. GROWINGUP MISTY FOREST GAZEBO - DAY with LORCANS ARM to 0.4 88 70 in zone 3 layer 1 with GREEN CIRLCE to 0.4 124 232 in zone 3 at layer 2

It keeps saying its invalid and won’t let me preview it. Does anyone know what im doing wrong? ( Yes i noticed i spelled circle wrong but it still says that after i fixed it)

#2

You forgot the word “at”

#3

Omg! haha thanks so much, My fault for trying to write at night! thank you