Writing several files to SD-Card

Hello,

I want to save data on SD-Card. For this I'm using the "SLTHA001"-App and the RelaxKit. Creating, writing and closing of the first file works fine, but when I try to create the a second file the f_open function returns "FR_DISK_ERR". The SD-Card is formatted in "FAT"-Standard-Format. After a reset of the Controller, it is again possible to create one file, but no second file.

Does anyone know what I'm doing wrong?
Thank you.