ElementUI报错 Error in callback for watcher "data": "Error: [ElTable] prop row-key is required"

前端报错  Error in callback for watcher "data": "Error: [ElTable] prop row-key is required"

Error: [ElTable] prop row-key is required

<el-table 
    :data="props.row.Entities" 
    border size="mini" 
    :row-key="getRowKeys" 
    empty-text="暂无节点设计关系">
    <el-table-column type="selection" :reserve-selection="true" width="55"></el-table-column>
    <el-table-column prop="phone" label="所属阵营" ></el-table-column>
    <el-table-column prop="nickName" label="模型名称" ></el-table-column>
</el-table>

 JS

getRowKeys(row) {
    return row.staffTypeId;
},