Subject Error -104

I have found this funny issue and I don't know why...

I was working with some TIB_Query components connected to a grid. I have
just created the sql and make the connection live.

Everything worked fine, but I don't know what I have done, but now what
worked perfectly gives the error -104.

I have had to generate the SQL on UpdateSQL in order to put this error away.

Anybody knows what could be happenning?

Best regards,

Antoni Aloy