vue v-model uses the value in state and still reports an error

<input v-model="vmodel" type="text" @input="changeInput"/>

import { mapState,mapGetters,mapMutations,mapActions } from "vuex"

   ...mapState({    
            vmodel : (state) => state.vmodel
        }),
        
    ...mapMutations({
            SET_vmodel :"SET_vmodel"
        }),
        
    changeInput(event){
            this.SET_vmodel(event.target.value)
        }

here is part of the code. The value has been modified successfully, but the error is still reported. Note: the program can run