Error in Visual Studio when running a SSIS package

I need to export data from Oracle to SQL Server. To do this, I have built a dtsx package in SQL Server 2019. I am using Visual Studio 2019 (64bit) and an SSIS solution. On Oracle I use "Oracle in OraClient 11g_home1" (also 64bit). There I use the "Execute Package Task" to run the package. When I try to preview a table (any table!), I get the following message: > Arithmetic operation resulted in an overflow (System.Data) On other systems, where everything was 32bit, this worked fine. Does this have something to do with the 64bit? where is the problem?