Oracle Client Error OCI-22053 Overflow Error in .NET Framework

Its not a problem.
You can
1. Convert in Oracle all number to varchar and then in .Net again to number,
2. use round() func in all oracle querys that return number
for example : select round (t.nstartKm, 4) as nstartKm from ias_meta.v_ias_thread;

I found some links about that:
link 1

link 2