Error after Migration from 1.7.4 to 1.8.X

[pranavv@contata.co.in]

Hi,
I got following error when access some testcases after migrate 1.7.4 to 1.8.2.

Fatal error: Call to a member function getDisplayName() on a non-object in W:\www\testlink_182\gui\templates_c\%%2E^2E1^2E11686C%%tcView_viewer.tpl.php on line 179

We follow follwing steps for migration

Upgaradtion steps of testlink

01- Take backup of MYSql database.

02- Download testlink new version from provider website.

03- copy testlink newversion in uniserver\udrive\www\

04- start uniserver using start script.

05- For upgradation or fresh installation of testlink type http://localhost/testlink/install

06- For Fresh Installation click on new installation

07- For migration to new version first click on upgrade database.

08- Enter database username/password.

09- Accept license & ok.

10- It will upgrade database schema & tables

11- Now Go to migration section & click on Testlink Migration 1.7 to 1.8

12- Go to "STEP THREE" click on "click here" option.

13- Provide existing database name "testlink" & database username / password.

14- It automatically migrate all data from old version to new version. (Takes 10 - 15 Mins or more time depends on no of tests cases)

15- Now your testlink is up & running.

Thanks & Regd's
Pranav Vishnoi

[fman]

you are an user that has been deleted and his ID is present on other tables
(look for fields author_id) or similar