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SDAC 4.8.0.52, RAD Studio 2007.
Console Application works with TMSStoredProc.
Coinitialize(nil) used. Calling MyProc.Prepare or directly
MyProc.FindParam('FirstParam').AsInteger:=1;
MyProc.ExecProc
raises this exception.

Why this error is caused?

I can not reproduce the problem.
Please send me a complete small sample to dmitryg*devart*com to demonstrate it, including a script to create a stored procedure.