Not working with IE11

Unhandled Promise rejection: Syntax error ; Zone: ; Task: Promise.then ; Value: SyntaxError: Syntax error SyntaxError: Syntax error
at ../../../../http-aws-es/connector.js (http://localhost:4200/vendor.bundle.js:3512:1)
at webpack_require (http://localhost:4200/inline.bundle.js:55:12)
at UserService (eval code:57:9)
at _createClass (eval code:11121:13)
at _createProviderInstance$1 (eval code:11091:13)
at resolveNgModuleDep (eval code:11075:13)
at _createClass (eval code:11121:13)
at createProviderInstance$1 (eval code:11091:13)
at resolveNgModuleDep (eval code:11075:13)
at NgModuleRef.prototype.get (eval code:12308:9)
"Unhandled Promise rejection:"
"Syntax error"
"; Zone:"
""
"; Task:"
"Promise.then"
"; Value:"
{
[functions]: ,
proto: { },
__zone_symbol__currentTask: { },
description: "Syntax error",
message: "Syntax error",
name: "SyntaxError",
ngDebugContext: { },
number: -2146827286,
stack: "SyntaxError: Syntax error
at ../../../../http-aws-es/connector.js (http://localhost:4200/vendor.bundle.js:3512:1)
at webpack_require (http://localhost:4200/inline.bundle.js:55:12)
at UserService (eval code:57:9)
at _createClass (eval code:11121:13)
at _createProviderInstance$1 (eval code:11091:13)
at resolveNgModuleDep (eval code:11075:13)
at _createClass (eval code:11121:13)
at createProviderInstance$1 (eval code:11091:13)
at resolveNgModuleDep (eval code:11075:13)
at NgModuleRef.prototype.get (eval code:12308:9)",
Symbol()_i.sxim7lganrf: undefined,
Symbol(observable)_h.sxim7lganrf: undefined,
Symbol(rxSubscriber)_g.sxim7lganrf: undefined
}
"SyntaxError: Syntax error
at ../../../../http-aws-es/connector.js (http://localhost:4200/vendor.bundle.js:3512:1)
at webpack_require (http://localhost:4200/inline.bundle.js:55:12)
at UserService (eval code:57:9)
at _createClass (eval code:11121:13)
at _createProviderInstance$1 (eval code:11091:13)
at resolveNgModuleDep (eval code:11075:13)
at _createClass (eval code:11121:13)
at createProviderInstance$1 (eval code:11091:13)
at resolveNgModuleDep (eval code:11075:13)
at NgModuleRef.prototype.get (eval code:12308:9)"

any idea ?