problem description
my tree child component receives the data passed by the parent component, clicks the parent component button to modify the data passed to the child component, and reports such an error. 
the environmental background of the problems and what methods you have tried
my sub-component uses watch to listen deeply on incoming objects, but it still doesn"t work.
related codes
/ / Please paste the code text below (do not replace the code with pictures)
< base-tree: treeHeight= "(height-40)": load= "true": treeId= "6655" v MutomonParc treeChange = "treeClick": treeDataObj= "treeObj" > < / base-tree >
watch: {
treeDataObj: {
handler(newVal, oldVal) {
this.sw = false;
if (newVal) {
this.nodeArray=[];
this.index = newVal.index;
this.groupId = "";
this.isUser = newVal.isUser;
this.ztreeDataSourceSync = [];
if(newVal.searchText){
this.searchText = newVal.searchText;
this.treeSearch();
}else{
this.page = 1;
this.loadUserGroupTreeFromEs();
}
}
},
deep: true //
},