Hello,
i m using JSFC client and i used the example "SimpleFieldDisplay" in your documentation with the follwoing configuration 
*serverType: sapi 
*serverList: vretlotsdev01 
*portNumber: 8101 
*serviceName: SYNK_DRIVEN_REC 
*fieldName: GEN_VAL8 
*symbol: JPY6MX10YN2=R
but when it encounter the following line of code : 
           service = session.getRecordService(
    _configDb.variable(_appId, "serviceName",       "SYNK_DRIVEN_REC").toString());
it give me the following error:
<SimpleFieldDisplay :  Error : Unable to read MFEED Data Dictionary from file.