OnTableChange: System has been illegally re-entered

I'm writing an application with Delphi3 Client/Server and Paradox for
multiple users (WinNT). I'm using queries, and I want, that the users will
get automatic indication, when changes are occurred in the table.

I installed the new TTable component - TRegisterTable, and I wrote
OnTableChange:
ShowMessage('The table was changed');

When I run my program and make any changes in queries, that are saving
into the table, I can see my message, but after this I get error: 'System
has been illegally re-entered'.

Does anybody know what's it?
Any help will be appreciated.

Rita.

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