Hana Express Edition: Change SSFS Master Keys error

Hi,

i tried to change the SSF Master Key from the Hana Express Edition. I copied the two lines from the manual (pdf):

1. RSEC_SSFS_DATAPATH=/usr/sap/HXE/SYS/global/hdb/security/ssfs
2. RSEC_SSFS_KEYPATH=/usr/sap/HXE/SYS/global/hdb/security/ssfs rsecssfx changekey $(rsecssfx generatekey -getPlainValueToConsole)

The result of the last line is this error:

SSFS-7255: Directory for the file persistence cannot be determined. The
secure storage the file system retrieves this information from a
profile file with which the executable has been called ("pf=<...>";
typically an instance profile; in this file or the underlying default
profile, "rsec/ssfs_datapath" is defined). For executables that do not
use profiles, environment variable RSEC_SSFS_DATAPATH is read to
determine this directory.

Can anyone help?

Thanks!