Error: "exec(): 0509-036 Cannot load program ./qexecd because of the following errors:" during (4213504)

Error received during Quest Server Agent Upgrade:

"exec(): 0509-036 Cannot load program ./qexecd because of the following errors:
0509-150 Dependent module libclntsh.a(shr.o) could not be loaded.
0509-022 Cannot load module libclntsh.a(shr.o).
0509-026 System error: A file or directory in the path name does not exist."

or

When stop/starting the QSA after the upgrade:
./QSAStop.sh
exec(): 0509-036 Cannot load program ./qexecd because of the following errors:
0509-150 Dependent module /oracle/client/10x_64/instanctclient/libclntsh.a(shr.o) could not be loaded.
0509-103 The module has an invalid magic number.
Completed

./QSAStart.sh
exec(): 0509-036 Cannot load program ./qexecd because of the following errors:
0509-150 Dependent module /oracle/client/10x_64/instanctclient/libclntsh.a(shr.o) could not be loaded.
0509-103 The module has an invalid magic number.
Failed QSA-20316 Couldn't start daemon