Dashboard conversion to Kinetic - XML error

Hi,

I am converting a classic dashboard from 10.2.400 to kinetic 2021.1.7. When I do a Generate preview, I get the following error. I do not know where to look and then fix it. The dashboard has been working in the classic view for many years.

Application Error

Exception caught in: Epicor.ServiceModel

Error Detail

Correlation ID: de4ba081-7af1-4299-a0bf-ad854c6650b4
Message: There is an error in XML document (23, 6).
Inner Exception Message: Value was either too large or too small for a signed byte.
Program: Epicor.ServiceModel.dll
Method: ShouldRethrowNonRetryableException

Client Stack Trace

at Epicor.ServiceModel.Channels.ImplBase`1.ShouldRethrowNonRetryableException(Exception ex, DataSet[] dataSets)
at Ice.Proxy.Lib.MetaFXImpl.GenerateView(EpMetaFxGenerateViewRequest request)
at Ice.UI.Dashboard.DashboardAppBuilder.GenerateKineticPreview(DashboardDirector director, Boolean launch)

Inner Exception

Value was either too large or too small for a signed byte.

Thanks in advance for your help