I am facing Munit error

I am mocking the salesforce but still, i think it's calling to direct endpoint so i am getting this error.

java.lang.AssertionError: at file: [case-implementation-test-suite.xml], line: [424]

Expected: 200 as Number {encoding: "UTF-8", mediaType: "application/java; charset=UTF-8", mimeType: "application/java", class: "java.lang.Integer"}

   but: 500 as Number {encoding: "UTF-8", mediaType: "application/java; charset=UTF-8", mimeType: "application/java", class: "java.lang.Integer"} at (root)

at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)

can any one kindly advice on this.

Regards,