Gettting Failed to authenticate with proxy

[mini2018in]

I am getting below Exception. Can somebody tell me why we get this exception. Is there any environment variable wrong/missing or any setup related issue.
Getting this exception on openshift version 3.7
[ERROR]
io.fabric8.kubernetes.client.KubernetesClientException: An error has occurred.
at io.fabric8.kubernetes.client.KubernetesClientException.launderThrowable(KubernetesClientException.java:57)
at io.fabric8.kubernetes.client.dsl.base.BaseOperation.getRootPaths(BaseOperation.java:190)
at io.fabric8.kubernetes.client.BaseClient.rootPaths(BaseClient.java:150)
at io.fabric8.openshift.client.OpenshiftAdapterSupport.isOpenShift(OpenshiftAdapterSupport.java:51)
at io.fabric8.openshift.client.OpenshiftAdapterSupport.isAdaptable(OpenshiftAdapterSupport.java:35)
at io.fabric8.kubernetes.client.AutoAdaptableKubernetesClient.adapt(AutoAdaptableKubernetesClient.java:107)
at io.fabric8.kubernetes.client.AutoAdaptableKubernetesClient.(AutoAdaptableKubernetesClient.java:96)
.......
Caused by: java.io.IOException: Failed to authenticate with proxy
at okhttp3.internal.connection.RealConnection.createTunnel(RealConnection.java:320)
at okhttp3.internal.connection.RealConnection.buildTunneledConnection(RealConnection.java:155)
at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:111)
at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:193)
at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:129)
at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:98)
at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:109)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:124)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at io.fabric8.kubernetes.client.utils.HttpClientUtils$3.intercept(HttpClientUtils.java:102)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:170)
at okhttp3.RealCall.execute(RealCall.java:60)
at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleResponse(OperationSupport.java:235)
at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleResponse(OperationSupport.java:230)
at io.fabric8.kubernetes.client.dsl.base.BaseOperation.getRootPaths(BaseOperation.java:183)
... 13 more