I have the NL-REDIRECT-03 error which warns Unable to perform redirect,the previous request did not perform a redirection.It occurs in the login page only ..please describe how to solve the problem in detail.
This error is a consequence of a previous issue. That means that this request is configured to a follow a redirection from the previous server response. But it seems that the previous server response was not a redirection.
You said that it happens on the login, that probably means that the login failed. You should look at the response of the request that is just before the one that failed. And compared it with the recording.
Still your issue seems related to the load. So even your login credential are not correct or the application got an issue. You should look at the content of the previous response in case you have more information about the error.
Also you should try to manually login to your application when the test is in progress to see if you can reproduce the same behavior.