updating a variable in a netcdf file

[jbensabat]

Hello
I have a netcdf file with a number of variables and dimensions, one of them is NC_UNLIMITED
I am trying to update one variable in the file
so after having pulled the variables I call the following method

NcVar v;
float *fvalues;
// fill fvalues with new values for the size of the variable

v.Put(start,count,fvalues);

I get an exception
digging deeper with the debugger I get an error number -101 (HDF error).

has anybody delt with such kind of problem ?
any help would really be appreciated
best
jac