Facing problem in ValidateFunc in Schema attributes while writing custom provider

[sumitAgrawal007]

Terraform Version

Terraform v0.12.21

Terraform Configuration Files

"provider_type": {
				Type:     schema.TypeString,
				Optional: true,
				ForceNew: true,
				Default:  "AWS",
				ValidateFunc: validation.StringInSlice
			},

Expected Behavior

Terraform should accept the provided validator function. The validation.StringInSlice function shouldn't throw an error.

Actual Behavior

Instead it gives me a compilation error
Cannot use validation.StringInSlice (type func(valid []string, ignoreCase bool) schema.SchemaValidateFunc) as type SchemaValidateFunc less...

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[teamterraform]

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