I looked in the savegame, searching the number of the year, this may be the guilt
tradedates = {
SPA = {
year = 11826
month = january
day = 0
hour = 0
}
I'm going to correct it, how did it come there?
To keep tracking - if it works I just will leave this - I put the correction I did
tradedates = {
SPA = {
year = 1947
month = april
day = 2
hour = 0
}
which is coherent to the other dates listed