error: Failed to initialize NSS library when running yum in OEL 7.3

Error

[root@localhost yum.repos.d]# yum install oracle-ebs-server-R12-preinstall
error: Failed to initialize NSS library
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

   cannot import name ts

Please install a package which provides this module, or
verify that the module is installed correctly.

It's possible that the above module doesn't match the
current version of Python, which is:
2.7.5 (default, Sep  5 2016, 02:30:38)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-9)]

If you cannot solve this problem yourself, please go to
the yum faq at:
  http://yum.baseurl.org/wiki/Faq


Solution :
download nspr-4.13.1-1.0.el7_3.x86_64.rpm
with root go to /usr/lib64 and run below command

rpm2cpio nspr-4.13.1-1.0.el7_3.x86_64.rpm | cpio -idmv
error: Failed to initialize NSS library
./usr/lib64/libnspr4.so
./usr/lib64/libplc4.so
./usr/lib64/libplds4.so
563 blocks

and then run below command

[root@localhost lib64]# LD_PRELOAD=./usr/lib64/libnspr4.so yum update nspr
Loaded plugins: langpacks, ulninfo
Resolving Dependencies
--> Running transaction check
---> Package nspr.x86_64 0:4.11.0-1.el7_2 will be updated
---> Package nspr.x86_64 0:4.13.1-1.0.el7_3 will be an update
--> Finished Dependency Resolution

Dependencies Resolved

======================================================================================================

==================================================================
 Package                            Arch                                 Version                      

                  Repository                                Size
======================================================================================================

==================================================================
Updating:
 nspr                               x86_64                               4.13.1-1.0.el7_3             

                  ol7_latest                               126 k

Transaction Summary
======================================================================================================

==================================================================
Upgrade  1 Package

Total size: 126 k
Is this ok [y/d/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Updating   : nspr-4.13.1-1.0.el7_3.x86_64                                                           

                                                             1/2
  Cleanup    : nspr-4.11.0-1.el7_2.x86_64                                                             

                                                             2/2
  Verifying  : nspr-4.13.1-1.0.el7_3.x86_64                                                           

                                                             1/2
  Verifying  : nspr-4.11.0-1.el7_2.x86_64                                                             

                                                             2/2

Updated:
  nspr.x86_64 0:4.13.1-1.0.el7_3

Complete!

now you can run yum install oracle-ebs-server-R12-preinstall