access to the administration console exchange 2016 https://xxx.Xxx.XX /ecp

someone can help me we have a problem of access to ECP when we pass via the LTM we receive the error message below 

Information technique : Uncaught ReferenceError: EcpAutoCompleteBehavior is not defined.
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Date: Thu May 23 2019 09:14:03 GMT+0000 (UTC+01:00)
Message: Uncaught ReferenceError: EcpAutoCompleteBehavior is not defined
Url: https://XXXX/ecp/UsersGroups/Mailboxes.slab?reqId=1558602843809&showhelp=false
Line: 176

Call Stack
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Error
  at Function.ErrorHandling.$Ee (https://XXXXX/ecp/15.1.1713.5/scripts/common.js:1:189941)
  at ErrorHandling.showUnhandledException (https://owa.ocpgroup.ma/ecp/15.1.1713.5/scripts/common.js:1:189026)




Dump Event
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	isTrusted = true
	message = Uncaught ReferenceError: EcpAutoCompleteBehavior is not defined
	filename = https://XXXXXX/ecp/UsersGroups/Mailboxes.slab?reqId=1558602843809&showhelp=false
	lineno = 176
	colno = 13
	error = ReferenceError: EcpAutoCompleteBehavior is not defined
	NONE = 0
	CAPTURING_PHASE = 1
	AT_TARGET = 2
	BUBBLING_PHASE = 3
	type = error
	target = [object Window]
	currentTarget = [object Window]
	eventPhase = 2
	bubbles = false
	cancelable = true
	defaultPrevented = false
	composed = false
	timeStamp = 159.40500000033353
	srcElement = [object Window]
	returnValue = true
	cancelBubble = false
	path = [object Window]
	composedPath = function composedPath() { [native code] }
	stopPropagation = function stopPropagation() { [native code] }
	stopImmediatePropagation = function stopImmediatePropagation() { [native code] }
	preventDefault = function preventDefault() { [native code] }
	initEvent = function initEvent() { [native code] }

Detailed Call Stack
-------------------