CredentialRequiredExcept thrown for webitem in Project Admin page for users other than System Admin

[arunk]

When i access the Project Administration page using System administrator, I am getting the response, but if the Project Administrator access the Webitem in Administration page, it throws credentialRequiredException.

I am trying to fetch the confluence pages using rest api’s. Can someone provide reason for this and possibly a solution to recover from this?

public String getResponseBody(String projectKey, String apiURL) {
 String responseBody = null;
 try {
ApplicationLinkRequestFactory requestFactory = getApplicationLink(projectKey);
 if (requestFactory != null) {
 ApplicationLinkRequest request = requestFactory.createRequest(MethodType.GET, apiURL);
 responseBody = request.execute();
}
 return responseBody;
 } catch (ResponseException e) {
 e.printStackTrace();
 } catch (CredentialsRequiredException e1) {
 e1.printStackTrace();
 }
 return responseBody;
 }