Problem With Enabling The Fulltext Search

Hello,
I try to get the full-text search on SQL Server Express with advanced Services SP2
running, but I got some problems.
First I tell you what I did.
I created a new database called TestDB.

Then I created a TestTable inside the db with a Primary Key:

CREATE TABLE [dbo].[TestTable](
[id] [int] IDENTITY(1,1) NOT NULL,
[text] [ntext] COLLATE Latin1_General_CI_AS NULL,
CONSTRAINT [PK_TestTable] PRIMARY KEY CLUSTERED
(
[id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

Then I executed these commands:

sp_fulltext_database enable
create fulltext catalog testcatalog as default
create fulltext index on TestTable(text) key index PK_TestTable

Now the problem:
When I insert some rows in the Table the catalog get not populated.
(change Tracking Setting is set to auto)
Instead these error messages are written into the crawl log:

Error '0x80004005' occurred during full-text index population for table or indexed view
'[TestDB].[dbo].[TestTable]' (table or indexed view ID '2073058421', database ID '5'),
full-text key value 0x00000002. Attempt will be made to reindex it.

The component 'sqlfth90.dll' reported error while indexing.
Component path 'c:ProgrammeMicrosoft SQL Server90COMsqlfth90.dll'.

Can somebody give me a hint?

Greetings,
Phillip