Why I am receiving this error "an unhandled exception occurred while processing the request? "

An unhandled exception occurred while processing the request.
FormatException: Index (zero based) must be greater than or equal to zero and less than the size of the argument list.
System.Text.StringBuilder.AppendFormatHelper(IFormatProvider provider, string format, ParamArray args)

FormatException: Index (zero based) must be greater than or equal to zero and less than the size of the argument list.
System.Text.StringBuilder.AppendFormatHelper(IFormatProvider provider, string format, ParamsArray args)
string.FormatHelper(IFormatProvider provider, string format, ParamsArray args)
string.Format(IFormatProvider provider, string format, object arg0, object arg1)
System.ComponentModel.DataAnnotations.RegularExpressionAttribute.FormatErrorMessage(string name)
Microsoft.AspNetCore.Mvc.DataAnnotations.ValidationAttributeAdapter<TAttribute>.GetErrorMessage(ModelMetadata modelMetadata, object[] arguments)
Microsoft.AspNetCore.Mvc.DataAnnotations.Internal.RegularExpressionAttributeAdapter.GetErrorMessage(ModelValidationContextBase validationContext)
Microsoft.AspNetCore.Mvc.DataAnnotations.Internal.RegularExpressionAttributeAdapter.AddValidation(ClientModelValidationContext context)
Microsoft.AspNetCore.Mvc.ViewFeatures.DefaultValidationHtmlAttributeProvider.AddValidationAttributes(ViewContext viewContext, ModelExplorer modelExplorer, IDictionary<string, string> attributes)
Microsoft.AspNetCore.Mvc.ViewFeatures.ValidationHtmlAttributeProvider.AddAndTrackValidationAttributes(ViewContext viewContext, ModelExplorer modelExplorer, string expression, IDictionary<string, string> attributes)
Microsoft.AspNetCore.Mvc.ViewFeatures.DefaultHtmlGenerator.AddValidationAttributes(ViewContext viewContext, TagBuilder tagBuilder, ModelExplorer modelExplorer, string expression)
Microsoft.AspNetCore.Mvc.ViewFeatures.DefaultHtmlGenerator.GenerateInput(ViewContext viewContext, InputType inputType, ModelExplorer modelExplorer, string expression, object value, bool useViewData, bool isChecked, bool setId, bool isExplicitValue, string format, IDictionary<string, object> htmlAttributes)
Microsoft.AspNetCore.Mvc.ViewFeatures.DefaultHtmlGenerator.GenerateTextBox(ViewContext viewContext, ModelExplorer modelExplorer, string expression, object value, string format, object htmlAttributes)
Microsoft.AspNetCore.Mvc.TagHelpers.InputTagHelper.GenerateTextBox(ModelExplorer modelExplorer, string inputTypeHint, string inputType, IDictionary<string, object> htmlAttributes)
Microsoft.AspNetCore.Mvc.TagHelpers.InputTagHelper.Process(TagHelperContext context, TagHelperOutput output)
Microsoft.AspNetCore.Razor.TagHelpers.TagHelper.ProcessAsync(TagHelperContext context, TagHelperOutput output)
Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperRunner.RunAsync(TagHelperExecutionContext executionContext)
AspNetCore.Views_Contacts_Create.<ExecuteAsync>b__20_0() in Create.cshtml
+
            <input asp-for="PhoneNumber" type="tel" class="form-control">
Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperExecutionContext.GetChildContentAsync(bool useCachedResult, HtmlEncoder encoder)
Microsoft.AspNetCore.Mvc.TagHelpers.RenderAtEndOfFormTagHelper.ProcessAsync(TagHelperContext context, TagHelperOutput output)
Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperRunner.RunAsync(TagHelperExecutionContext executionContext)
AspNetCore.Views_Contacts_Create.ExecuteAsync() in Create.cshtml
<big>+
    ViewBag.Title = "Register";</big>
Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageCoreAsync(IRazorPage page, ViewContext context)
Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageAsync(IRazorPage page, ViewContext context, bool invokeViewStarts)
Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderAsync(ViewContext context)
Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(ViewContext viewContext, string contentType, Nullable<int> statusCode)
Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(ActionContext actionContext, IView view, ViewDataDictionary viewData, ITempDataDictionary tempData, string contentType, Nullable<int> statusCode)
Microsoft.AspNetCore.Mvc.ViewFeatures.ViewResultExecutor.ExecuteAsync(ActionContext context, ViewResult result)
Microsoft.AspNetCore.Mvc.ViewResult.ExecuteResultAsync(ActionContext context)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeResultAsync(IActionResult result)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResultFilterAsync<TFilter, TFilterAsync>()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResultExecutedContext context)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.ResultNext<TFilter, TFilterAsync>(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeResultFilters()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;

namespace Contact.Models
{
    public class Contacts
    {
        public int ContactId { get; set; }
        [Required (ErrorMessage ="Please Provide A Value For First Name")]
        public string FirstName { get; set; }
        [Required (ErrorMessage ="Please Provide A Value For The Last Name")]
        public string LastName { get; set; }
        [Required(ErrorMessage ="Please Provide A Value For The WorkPlace ")]
        public string WorkPalce { get; set; }
        [Required(ErrorMessage ="Please Provide A Value For Phone Number")]
        [RegularExpression(@"^(01)[0-9]{9,}$", ErrorMessage = "The Phone Number Does 
        Not Match The Pattern @(201)[0-9]{9}")]
        public int PhoneNumber { get; set; }
        [Required(ErrorMessage ="Please Provide Email Adress")]
        [RegularExpression(@"^([a-zA-Z0-9_\-\.]+)@([a-zA-Z0-9_\-\.]+)\.([a-zA-Z] 
        {2,5})$", ErrorMessage ="Invalied Email Pattern")]
        public string Email { get; set; }
        [Required(ErrorMessage ="Please Provide A Data Of Birth")]
        [RegularExpression(@"^[0-9]{2}\/[0-9]{2}\/[0-9]{4}$", ErrorMessage ="Please 
        Enter A valid Date Of Birth Matches Pattern DD/MM/YYYY")]
        public string DateOfBirth { get; set; }
        public string Note { get; set; }
        
    }
}

 @model Contacts

@{ 
    ViewBag.Title = "Register";
}

<div class="container-fluid">
    <form asp-action="Create" asp-controller="Contacts" method="post">
        <div class="form-group">
            <label asp-for="FirstName">First Name</label>
            <input type="text" class="form-control" asp-for="FirstName">
            <span asp-validation-for="FirstName"></span>
        </div>
        <div class="form-group">
            <label asp-for="LastName">Last Name</label>
            <input type="text" class="form-control" asp-for="LastName">
            <span asp-validation-for="LastName"></span>
        </div>
        <div class="form-group">
            <label asp-for="WorkPalce">Work</label>
            <input type="text" class="form-control" asp-for="WorkPalce">
            <span asp-validation-for="WorkPalce"></span>
        </div>
        <div class="form-group">
            <label asp-for="PhoneNumber">Phone Number</label>
            <input asp-for="PhoneNumber" type="tel" class="form-control">
            <span asp-validation-for="PhoneNumber"></span>
        </div>
        <div class="form-group">
            <label asp-for="Email">Email</label>
            <input type="email" class="form-control" asp-for="Email">
             <span asp-validation-for="Email"></span>
        </div>
        <div class="form-group">
            <label asp-for="DateOfBirth">Date Of Birth</label>
            <input type="date" class="form-control" asp-for="DateOfBirth">
            <span asp-validation-for="DateOfBirth"></span>
        </div>
        <div class="form-group">
            <label asp-for="Note">Comments</label>
            <textarea class="form-control" asp-for="Note"></textarea>
        </div>
        <button type="submit" class="btn btn-primary">Submit</button>
        
    </form>
</div>