# Buggy code
def close(self):
    """
    Cleanup and (if leave=False) close the progressbar.
    """
    if self.disable:
        return

    # Prevent multiple closures
    self.disable = True

    # decrement instance pos and remove from internal set
    pos = abs(self.pos)
    self._decr_instances(self)

    # GUI mode
    if not hasattr(self, "sp"):
        return

    # annoyingly, _supports_unicode isn't good enough
    def fp_write(s):
        self.fp.write(_unicode(s))

    try:
        fp_write("")
    except ValueError as e:
        if "closed" in str(e):
            return
        raise  # pragma: no cover

    with self._lock:
        if pos:
            self.moveto(pos)

        if self.leave:
            if self.last_print_n < self.n:
                # stats for overall rate (no weighted average)
                self.avg_time = None
                self.sp(self.__repr__())
            if pos:
                self.moveto(-pos)
            else:
                fp_write("\n")
        else:
            self.sp("")  # clear up last bar
            if pos:
                self.moveto(-pos)
            else:
                fp_write("\r")


# Traceback (RuntimeError)
[s1758208@login04(eddie) ~]$ conda create -n test
[s1758208@login04(eddie) ~]$ conda activate test
(test) [s1758208@login04(eddie) ~]$ conda install python
Solving environment: done

## Package Plan ##

environment location: /exports/csce/eddie/ph/groups/rbm_ml/michael/myconda/envs/test

added / updated specs:
- python


The following packages will be downloaded:

package                    |            build
---------------------------|-----------------
python-3.6.4               |       hc3d631a_3        29.1 MB
libstdcxx-ng-7.2.0         |       hdf63c60_3         2.5 MB
certifi-2018.1.18          |           py36_0         144 KB
zlib-1.2.11                |       ha838bed_2         101 KB
sqlite-3.22.0              |       h1bed415_0         1.5 MB
wheel-0.30.0               |   py36hfd4bba0_1          67 KB
openssl-1.0.2n             |       hb7f436b_0         3.4 MB
libffi-3.2.1               |       hd88cf55_4          43 KB
libgcc-ng-7.2.0            |       hdf63c60_3         6.1 MB
ncurses-6.0                |       h9df7e31_2         920 KB
tk-8.6.7                   |       hc745277_3         3.2 MB
setuptools-38.5.1          |           py36_0         525 KB
pip-9.0.1                  |           py36_5         2.2 MB
libedit-3.1                |       heed3624_0         171 KB
ca-certificates-2017.08.26 |       h1d4fec5_0         263 KB
------------------------------------------------------------
Total:        50.2 MB

The following NEW packages will be INSTALLED:

ca-certificates: 2017.08.26-h1d4fec5_0
certifi:         2018.1.18-py36_0
libedit:         3.1-heed3624_0
libffi:          3.2.1-hd88cf55_4
libgcc-ng:       7.2.0-hdf63c60_3
libstdcxx-ng:    7.2.0-hdf63c60_3
ncurses:         6.0-h9df7e31_2
openssl:         1.0.2n-hb7f436b_0
pip:             9.0.1-py36_5
python:          3.6.4-hc3d631a_3
readline:        7.0-ha6073c6_4
setuptools:      38.5.1-py36_0
sqlite:          3.22.0-h1bed415_0
tk:              8.6.7-hc745277_3
wheel:           0.30.0-py36hfd4bba0_1
xz:              5.2.3-h55aa19d_2
zlib:            1.2.11-ha838bed_2

Proceed ([y]/n)? y


Downloading and Extracting Packages
python 3.6.4: ########################################################## | 100%
libstdcxx-ng 7.2.0: #################################################### | 100%
certifi 2018.1.18: ##################################################### | 100%

# >>>>>>>>>>>>>>>>>>>>>> ERROR REPORT <<<<<<<<<<<<<<<<<<<<<<

Traceback (most recent call last):
File "/home/s1758208/miniconda3/lib/python3.6/site-packages/conda/exceptions.py", line 789, in __call__
return func(*args, **kwargs)
File "/home/s1758208/miniconda3/lib/python3.6/site-packages/conda/cli/main.py", line 78, in _main
exit_code = do_call(args, p)
File "/home/s1758208/miniconda3/lib/python3.6/site-packages/conda/cli/conda_argparse.py", line 77, in do_call
exit_code = getattr(module, func_name)(args, parser)
File "/home/s1758208/miniconda3/lib/python3.6/site-packages/conda/cli/main_install.py", line 11, in execute
install(args, parser, 'install')
File "/home/s1758208/miniconda3/lib/python3.6/site-packages/conda/cli/install.py", line 255, in install
handle_txn(progressive_fetch_extract, unlink_link_transaction, prefix, args, newenv)
File "/home/s1758208/miniconda3/lib/python3.6/site-packages/conda/cli/install.py", line 281, in handle_txn
progressive_fetch_extract.execute()
File "/home/s1758208/miniconda3/lib/python3.6/site-packages/conda/core/package_cache.py", line 584, in execute
exc = self._execute_actions(prec_or_spec, prec_actions)
File "/home/s1758208/miniconda3/lib/python3.6/site-packages/conda/core/package_cache.py", line 599, in _execute_actions
progress_bar = ProgressBar(desc, not context.verbosity and not context.quiet, context.json)
File "/home/s1758208/miniconda3/lib/python3.6/site-packages/conda/common/io.py", line 390, in __init__
self.pbar = tqdm(desc=description, bar_format=bar_format, ascii=True, total=1)
File "/home/s1758208/miniconda3/lib/python3.6/site-packages/conda/_vendor/tqdm/_tqdm.py", line 388, in __new__
cls.monitor = TMonitor(cls, cls.monitor_interval)
File "/home/s1758208/miniconda3/lib/python3.6/site-packages/conda/_vendor/tqdm/_tqdm.py", line 83, in __init__
self.start()
File "/home/s1758208/miniconda3/lib/python3.6/threading.py", line 846, in start
_start_new_thread(self._bootstrap, ())
RuntimeError: can't start new thread

# Fixed code
def close(self):
    """
    Cleanup and (if leave=False) close the progressbar.
    """
    if self.disable:
        return

    # Prevent multiple closures
    self.disable = True

    # decrement instance pos and remove from internal set
    pos = self.pos
    self._decr_instances(self)

    # GUI mode
    if not hasattr(self, "sp"):
        return

    # annoyingly, _supports_unicode isn't good enough
    def fp_write(s):
        self.fp.write(_unicode(s))

    try:
        fp_write("")
    except ValueError as e:
        if "closed" in str(e):
            return
        raise  # pragma: no cover

    if pos:
        self.moveto(pos)

    if self.leave:
        if self.last_print_n < self.n:
            cur_t = self._time()
            # stats for overall rate (no weighted average)
            self.sp(
                self.format_meter(
                    self.n,
                    self.total,
                    cur_t - self.start_t,
                    (self.dynamic_ncols(self.fp) if self.dynamic_ncols else self.ncols),
                    self.desc,
                    self.ascii,
                    self.unit,
                    self.unit_scale,
                    None,
                    self.bar_format,
                    self.postfix,
                    self.unit_divisor,
                )
            )
        if pos:
            self.moveto(-pos)
        else:
            fp_write("\n")
    else:
        self.sp("")  # clear up last bar
        if pos:
            self.moveto(-pos)
        else:
            fp_write("\r")