A new error "can not send or receive network message" occur

[Xianmang]

After fixing several errors, I log in the AOL prompt :

chanwen@ubuntu:/opt/scidb/11.12/bin$ ./iquery
AQL% help;
set - List current options
set lang afl - Set AFL as querying language
set lang aql - Set AQL as querying language
set fetch - Start retrieving query results
set no fetch - Stop retrieving query results
set timer - Start reporting query setup time
set no timer - Stop reporting query setup time
set verbose - Start reporting details from engine
set no verbose - Stop reporting details from engine
quit or exit - End iquery session
AQL%

but when I tried to create an array, new error occur:

chanwen@ubuntu:/opt/scidb/11.12/bin$ ./iquery -aq "store(build(<num:double>[x=0:8,1,0, y=0:9,1,0], random()),random_numbers)";
SystemException in file: src/network/BaseConnection.cpp function: sendAndReadMessage line: 362
Error id: scidb::SCIDB_SE_NETWORK::SCIDB_LE_CANT_SEND_RECEIVE
Error description: Network error. Cannot send or receive network messages.


Hi, Expert, How to fix it ?

Best!