Error code 901 when add WebDAV drive

when i upgrade ver 1.8.0. i added drive with WevDAV but error

How to fix it?

Hi~ @Nguy_n_H_i_Dang,

The first approach is the re-add a drive after removing the legacy.
The second, please try to update Windows or upgrade .NET Framework to 4.8 (specially in Windows 7).

Even though, if this issue is not solved, please send log files (C:\ProgramData\OpenBoxLab\RaiDrive\log) to