modify is ambiguous in Mapped Statements collection (try using the full name including the namespace

异常：

java.lang.IllegalArgumentException: modify is ambiguous in Mapped Statements collection (try using the full name including the namespace, or rename one of the entries)
 at org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:466)
 at org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:349)
 at org.apache.ibatis.binding.MapperMethod.setupCommandType(MapperMethod.java:137)
 at org.apache.ibatis.binding.MapperMethod.(MapperMethod.java:46)
 at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:34)
 at $Proxy10.modify(Unknown Source)

这样的错误，一般来说是Mapper.xml没有配置，或者命名空间错误，系统找不到相关的映射。