I need your help (Report Viewer Question)

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reporting-services

Hello

I have a big problem with my Reports in asp.net.
I explain it for you and I hope you can answer me, because it makes me crazy.

I created a simple Report with Microsoft Report Viewer
VERY SIMPLE (HELLO WORLD !!!)

It works fine, but when I publish it in webserver (any webserver, even localhost), it dosen't work and show this error in report viewer:

***********************************************************************

An error occurred during local report processing.
The definition of the report 'Main Report' is invalid.
The report definition is not valid.
Details: Data at the root level is invalid. Line 1, position 1.

***********************************************************************

:confused:

By the way, you can see my project if you want. I can email it to you.

I really need to do this in my project.
I will be very thankful if you help me.

Best Regards,
Boroumandan