Crystal report with Excel as DataSource problem

Hi to all.

I developed a little program in C# that creates a report with CR using as datasource an Excel file.

On the development PC all works fine, instead, on the customer PC the programa throw an exception with the error "Database access failed"

I installed CR on the customer pc and with the client the reports works without problems.

Has CR SDK a Log that help me with the problem? Where can be the problem?

BR

Diego