我使用 formik react mui 技术并且此代码块给出

Cannot read properties of undefined (reading 'fullName')

 const formik = useFormik({
    initalValues: {
        fullName: "",
        email:"",
        phone:"",
        select:"",
        message:""
    },
    onSubmit: (values)=> {
        console.log(JSON.stringify(values))
    },
})


 <form onSubmit={formik.handleSubmit}>
            <Grid container spacing={3}>
                
                <Grid item md={6} xs={12}>
                    <TextField fullWidth name='fullName' value={formik.values.fullName} onChange={formik.handleChange} id="fullName" label="Ad Soyad" variant="outlined" />
                </Grid>