Given following log snippets, their explanation, and nothing else, explain what failure, if any, occurred during build of this package.

  Snippets are in a format of [X] : [Y], where [X] is a log snippet, and [Y] is the explanation.

  Snippets are delimited with '================'.

  Drawing on information from all snippets, provide a concise explanation of the issue and recommend a solution.

  Explanation of the issue, and recommended solution, should take a handful of sentences.

  Snippets:

  [cp: cannot stat 'nmbl.spec': No such file or directory]: [File `nmbl.spec` couldn't be found at the expected location. Program `cp` couldn't be successfully executed.]
=============
[Traceback (most recent call last):
  File "/usr/bin/copr-sources-custom", line 115, in <module>
    run_cmd(mock + ['--chroot', 'su - {0} -c {1}'.format(user, cmd)])
    ~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/bin/copr-sources-custom", line 64, in run_cmd
    return subprocess.check_call(command, **kwargs)
           ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.13/subprocess.py", line 419, in check_call
    raise CalledProcessError(retcode, cmd)]: [Traceback from execution of program written in Python. It indicates that a sub-process launched with specific arguments failed. The exception raised is meant to indicate that failure.]

Issue: File `nmbl.spec` was not at the expected location.
Resolution: Check presence of `nmbl.spec`in the build environment and ensure that it is present at the expected location, or change the expected location to match the actual location of the file.