BIRT报告错误“无法准备数据集的查询执行”

Question

嗨，我收到以下异常

org.eclipse.datatools.connectivity.oda.OdaException: Query command is not valid.
    at org.eclipse.birt.report.data.adapter.impl.DataRequestSessionImpl.populateDimension(DataRequestSessionImpl.java:1358)
    at org.eclipse.birt.report.data.adapter.impl.DataRequestSessionImpl.populateDimensions(DataRequestSessionImpl.java:1204)
    at org.eclipse.birt.report.data.adapter.impl.DataRequestSessionImpl.createCube(DataRequestSessionImpl.java:797)
    at org.eclipse.birt.report.data.adapter.impl.DataRequestSessionImpl.materializeCube(DataRequestSessionImpl.java:739)
    ... 47 more
Caused by: org.eclipse.birt.report.data.adapter.api.AdapterException: Failed to prepare the query execution for the data set

我是BIRT报告的新手，不知道为什么会产生这个错误。