the mistake was somehow in the naming of the rbz for the encryption in the signing portal ( i named the rbz exactly as the prog. rb and the folder in it , means all 3 same name)
after changing that i could encrypt again
so many thanx !!!
by the way: if you want to keep your ruby working from skp 2018 on and have a new laptop,
is there a way for a developer to install 2018 (I read somewhere, that if you have 2019 – 2021 instralled, it was no more possible to install 2018 ……