我尝试从数据库中检索员工数据，但不显示数据内容。
ERROR
Error {rejection: TypeError, promise: t, zone: r, task: e, stack: (...)…}
message: "Uncaught (in promise): TypeError: Cannot set property 'lat' of undefined↵TypeError: Cannot set property 'lat' of undefined↵ at file:///android_asset/www/build/28.js:180:27↵ at t.invoke (file:///android_asset/www/build/polyfills.js:3:14976)↵ at Object.zone._inner.zone._inner.fork.onInvoke (file:///android_asset/www/build/vendor.js:4248:33)↵ at t.invoke (file:///android_asset/www/build/polyfills.js:3:14916)↵ at r.run (file:///android_asset/www/build/polyfills.js:3:10143)↵ at file:///android_asset/www/build/polyfills.js:3:20242↵ at t.invokeTask (file:///android_asset/www/build/polyfills.js:3:15660)↵ at Object.zone._inner.zone._inner.fork.onInvokeTask (file:///android_asset/www/build/vendor.js:4239:33)↵ at t.invokeTask (file:///android_asset/www/build/polyfills.js:3:15581)↵ at r.runTask (file:///android_asset/www/build/polyfills.js:3:10834)"
promise: t
rejection: TypeError
stack: (...)
get stack: function () { [native code] }
set stack: function () { [native code] }
task: e
zone: r
__proto__: d