Subreport Help

I'm having trouble getting a subreport to work inside a main report.
I keep getting this error upon preview:"A parameter in the subreport 'Summary' has the name @DB. Parameter names must be CLS-Compliant identifiers"

Here's a description of my setup right now.

In my Main Report, I have a Year(String) and CompanyCode(string) Report Parameters, with Available Values that I specified.
Right Clicking the subreport, in the SubReport Properties(still on the main report), I specified the subreport I want to use and on the parameters tab, I have two parameters @DB with the value of =Parameters!CompanyCode.Value, and @Yr with the value of =Parameters!Year.Value

In the Subreport, the Dataset has 2 parameters, @DBName and @Year
On the Layout section, the Report Parameters are the same as the main report.

I do not have a dataset on the main report because it's not needed, I basically only need it to pick between either the Detail and Summary sub-reports to show.

Any help on this would be greatly appreciated, I'm still pretty new to SRS, but I'm learning quickly and have picked up a lot, some things I still struggle with.

Thanks!