App - dlsym: /.../libTWAINDS_FreeImage.so: undefined symbol: DSM_Entry

[xiaoyudannew]

Is this "DSM_Entry" method not implemented in "Twain_DS_sample01"?
I found the declare in twain.h, but the implements not in "Twain_DS_sample01".

This is my run (I changed the DSM lib path, my path is right, is not the problem!):

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Please enter an option

q - quit
h - help
cdsm - connect to the dsm
xdsm - disconnect from the dsm
lds - list data sources available
pds# - print identity structure for data source with id#. ex: pds2
cds# - connect to data source with id#. ex: cds2
xds - disconnect from data source
caps - negotiate capabilities
scan - start the scan

(h for help) > cdsm

App - dlsym: /home/xyd/twain/lib/libTWAINDS_FreeImage.so: undefined symbol: DSM_Entry