Hi,
The error "Crop stages for rotation scheme no. 1 all all before start of simulation" indicates that the first crop under "Landuse/Vegetation" has a start and end date that are before the simulation start. Meaning that the whole crop development of the first crop (named as rotation scheme no. 1) are before the simulation period. The same is the case with crop 1,2,3 and 4.
Note that you your crop development could start before and end after your simulation period but you need to have crop development within your simulation period. Check start date for the crop and the number of days specified for the crop development as it ends up with a crop development before your simulation period.
Best regards
Oluf (DHI)