Getting HTTP Status 500 when doing a POST

Hi, I am new to this. I tried to do a POST using this “https://www.XXXXXXXXXXX.com/ms-csi/registrations/code/XXXX20/number/523?date=2020-08-03”, but I am getting the following message. What is problem? How can I resolve it?

Apache Tomcat/7.0.63 - Error report < !--H1 { font-family: Tahoma, Arial, sans-serif; color: white; background-color: #525D76; font-size: 22px; }
	H2 {
		font-family: Tahoma, Arial, sans-serif;
		color: white;
		background-color: #525D76;
		font-size: 16px;
	}

	H3 {
		font-family: Tahoma, Arial, sans-serif;
		color: white;
		background-color: #525D76;
		font-size: 14px;
	}

	BODY {
		font-family: Tahoma, Arial, sans-serif;
		color: black;
		background-color: white;
	}

	B {
		font-family: Tahoma, Arial, sans-serif;
		color: white;
		background-color: #525D76;
	}

	P {
		font-family: Tahoma, Arial, sans-serif;
		background: white;
		color: black;
		font-size: 12px;
	}

	A {
		color: black;
	}

	A.name {
		color: black;
	}

	HR {
		color: #525D76;
	}

	-->
</style>

HTTP Status 500 - null


type Status report

message null

description The server encountered an internal error that prevented it from fulfilling this request.


Apache Tomcat/7.0.63

Are you sure that is a valid url you can POST to?