I think u have to tell us what u have copied and how.
Usually u can't rename Dat files.
i.e.
u have :
NDD_Somers/NDD_Somers.dat
NDD_Somers/NDD_Somers.sim
NDD_Somers/NDD_Somers.eqp
bla bla bla
And u say:
NDD_Somers2/NDD_Somers2.dat
NDD_Somers2/NDD_Somers2.sim
NDD_Somers2/NDD_Somers2.eqp
bla bla bla
-> appcrash
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