Why doesn't svn update command work ?

Attached is the version of svn client I'm using.

C:\> cd Projects \ my_workspace

I had entered following command:
C:\Projects\my_workspace> svn checkout https://abcd.efg.com/svn/repository/my_project/trunk my_working_copy

Checkout was successful.

I tried updating as follows:
C:\Projects\my_working_copy> svn update

Attached is svn update output. Why doesn't svn update work?

The answer is in google. There was no tmp folder under .svn folder. I manually created tmp folder and then svn update command worked.

I'll report this bug to SlikSvn.