thanks for your fast reply, you gave the right way.
I found that SGP has to be started with the option "as administrator". The second was that I had select SGP in the windows firewall. The error message "CamereXsize" it misleading. Now the Guider Chip is available in PHD2.
I am very sorry that I come with a another issue, which I cannot resolve at my own. It is not clear, if it is a SGP API Guider issue, but I had not this case with my two other guidcams (ASI and QHY).
PHD said, that I had to make a new dark library, right. Immediately after finishing it, the message apeared again. I tried it many times, no success to make a new dark lib.
The dialog in the middle is german. It says "Operation complete, Dark Lib created". After closing this dialog, the message "Dark library does not match the camera in this profile" reapeared again.