[Solved] vue.runtime.esm.js?2b0e:619 [Vue warn]: Error in render: “TypeError: Cannot read property ‘length‘

When using element UI as the form check box, the error vue.runtime.esm.js appears?2b0e: 619 [Vue warn]: error in render: “typeerror: cannot read property ‘length’, as shown in the following figure:

the code is as follows:

the solution is to add the checklist field in the form object as follows:

export default {
	data() {
 		return {
			form: {
				checkList: []

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