When I try to open the SAP web client it give me this error message

HTTP Status 500 – Internal Server Error

Type Exception Report

Message Error on accessing URL[httpsnull/sld/sld0100.svc/SystemInformation]::null

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

com.sap.b1.sld.client.exception.SLDServiceException: Error on accessing URL[httpsnull/sld/sld0100.svc/SystemInformation]::null
	com.sap.b1.sld.client.impl.SLDHttpClient.doServiceWithoutInnerLogin(SLDHttpClient.java:109)
	com.sap.b1.sld.client.impl.SLDHttpClient.doServiceWithoutInnerLogin(SLDHttpClient.java:81)
	com.sap.b1.sld.client.impl.SLDHttpClient.getSystemInfo(SLDHttpClient.java:161)
	com.sap.b1.sld.client.impl.SLDHttpClient.getSystemInfo(SLDHttpClient.java:137)
	com.sap.b1.sld.client.stateless.SLDHttpRequestBase.setTargetURL(SLDHttpRequestBase.java:262)
	com.sap.b1.sld.client.stateless.SLDPostService.<init>(SLDPostService.java:27)
	com.sap.businessone.saml2.sp.SLDMetadata.getCtxPathLevel(SLDMetadata.java:181)
	com.sap.businessone.saml2.sp.SLDMetadata.getSpCtxPathLevel(SLDMetadata.java:213)
	com.sap.businessone.saml2.sp.SAML2SPSession.<init>(SAML2SPSession.java:92)
	com.sap.businessone.saml2.sp.SAML2SPSession.getSession(SAML2SPSession.java:467)
	com.sap.businessone.saml2.sp.filters.LoginRequiredFilter.doFilter(LoginRequiredFilter.java:195)
	com.sap.b1.sld.common.web.filter.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:49)
	com.sap.businessone.security.filters.ClickjackFilter.doFilter(ClickjackFilter.java:27)

Note The full stack trace of the root cause is available in the server logs.

Apache Tomcat/8.5.41