Angular TypeError:无法读取属性'；已附上'；未定义的_Angular

Angular TypeError:无法读取属性'；已附上'；未定义的

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Angular TypeError:无法读取属性'；已附上'；未定义的,angular,Angular,当我将角度7更新为10时，出现了这个错误。有人帮我吗 TypeError: Cannot read property 'hasAttached' of undefined at MatDialogContainer.attachComponentPortal (dialog.js:184) at MatDialog._attachDialogContent (dialog.js:793) at MatDialog.open (dialog.js:671)

当我将角度7更新为10时，出现了这个错误。有人帮我吗

TypeError: Cannot read property 'hasAttached' of undefined
    at MatDialogContainer.attachComponentPortal (dialog.js:184)
    at MatDialog._attachDialogContent (dialog.js:793)
    at MatDialog.open (dialog.js:671)