following is workflow debug file, how to solve this issue?

*      OUTPUT FROM WORKFLOW DEBUG SETTINGS         *                                                                                   ****************************************************                                                                                   START FND_FLEX_WORKFLOW.INITIALIZE                                                                                                     APPLICATION_SHORT_NAME = SQLGL                                                                                                         CODE = GL#                                                                                                                             NUM = 50289                                                                                                                            ITEMTYPE = OECOGS                                                                                                                      APPLICATION ID = 101                                                                                                                   NUMBER OF SEGMENTS = 7                                                                                                                 ITEMKEY = #SYNCH                                                                                                                       PROCESS = CLT_DEFAULT_ACCOUNT_GENERATION                                                                                               END FND_FLEX_WORKFLOW.INITIALIZE                                                                                                       START FND_FLEX_WORKFLOW.GENERATE                                                                                                       ITEMTYPE = OECOGS                                                                                                                      ITEMKEY = #SYNCH                                                                                                                       INSERT_IF_NEW = TRUE                                                                                                                   START FND_FLEX_WORKFLOW_APIS.START_GENERATION                                                                                          START FND_FLEX_WORKFLOW_APIS.COPY_FROM_COMBINATION                                                                                     Account Generator is running for:                                                                                                      WF ITEM = OECOGS/#SYNCH                                                                                                                APPLICATION = 101/SQLGL                                                                                                                KEY FLEX = GL#/50289/7                                                                                                                 CCID = 6655                                                                                                                            REPLACE_CURRENT_VALUE = FALSE                                                                                                          Account Generator failed in FND_FLEX_WORKFLOW.GENERATE with following error                                                            .                                                                                                                                      ERROR_NAME    : WFENG_SYNCH_DISABLED                                                                                                   ERROR_MESSAGE : 3135: 'Wf_Item_Activity_Status.Set_Error(error_process)' is