Bug report: Application crashed with UnknownFileTypeError

## Automated report

_This issue was created with the app's automated bug reporting feature.
Attached to this issue is the full traceback as well as an environment
fingerprint that contains information about the operating system as well as all
installed libraries._

## Additional comments (optional):

_Example: I submitted a band structure calculation for Silica._

## Attachments

Traceback

```python-traceback
~/.local/lib/python3.9/site-packages/aiidalab_widgets_base/structures.py in _on_file_upload(self, change)
408 """When file upload button is pressed."""
409 for fname, item in change["new"].items():
--> 410 self.structure = self._read_structure(fname, item["content"])
411 self.file_upload.value.clear()
412 break

~/.local/lib/python3.9/site-packages/aiidalab_widgets_base/structures.py in _read_structure(self, fname, content)
430 structures = get_ase_from_file(temp_file.name, format="cif")
431 else:
--> 432 structures = get_ase_from_file(temp_file.name)
433 except ValueError as e:
434 self._status_message.message = f"""

~/.local/lib/python3.9/site-packages/aiidalab_widgets_base/utils/__init__.py in get_ase_from_file(fname, file_format)
45 traj = read(fname, format=file_format, index=":", store_tags=True)
46 else:
---> 47 traj = read(fname, format=file_format, index=":")
48 if not traj:
49 raise ValueError(f"Could not read any information from the file {fname}")

~/.local/lib/python3.9/site-packages/ase/io/formats.py in read(filename, index, format, parallel, do_not_split_by_at_sign, **kwargs)
729 format = format or filetype(filename, read=isinstance(filename, str))
730
--> 731 io = get_ioformat(format)
732 if isinstance(index, (slice, str)):
733 return list(_iread(filename, index, format, io, parallel=parallel,

~/.local/lib/python3.9/site-packages/ase/io/formats.py in get_ioformat(name)
292 """Return ioformat object or raise appropriate error."""
293 if name not in ioformats:
--> 294 raise UnknownFileTypeError(name)
295 fmt = ioformats[name]
296 # Make sure module is importable, since this could also raise an error.

UnknownFileTypeError: txt
```

Environment fingerprint

eNpdWF1v47gV_SuB-7oSLMl2JvO2HezLYtKmm2kXxWIRUBJtM6ZIRqTiKIv5771fVDR99CFF3o9zz730X5tXPUbj3eZz9dMmWJWO

fhw2n__aqLE7m6S7NI168_mPzWHXmrT5abP5E_bN6ezd0_LppinvyqqB1Q_ob9XN4_3DzcNvv_xy__Dt5tt5urlX8029v9nefq5v

Pzd3N__-9uWm3tbN5jscqbqLOulIVxvTq6LzePGmLpuygpMZDFFPvQe4Ani7wC-

TcmkadAyjjhHXd-t1q1o8qfk_rNAWLd2WVVmv4bMfdN5frRdeBK625bb9YeVq-pNOsWhVZKOrcqv4Ll8Ec1EAHspPchyE-

IWiJudbPbSmI69ki4umPqfBCkYnudl4-uqW94TQmzHSjl25Y2TwvSaX5BtM4qsugkpngnfs6Xjyri6649GgsUssP-CiNa437hR5v

eZ18q0p65oNiCn5i3a0p4QrCZtdV5y006NKfiTjKvo2JbK1ptAA8HfVasuh2pZInRYY0ClryU6-EKHgxxTL4-S65L2NhR2nolPdW

dPZB3K87cY5JMr6lkxrtZqSOU42-insaKGqeMVq-

BiQfd5qjbtotnSPv8GlM9m1Y7NGn6wJM5l1S2Z9weu_eJdGz9ZW4ATaQXaRmXRlXTKYXW-EaJ0ewTgKPbAfDq0XVO6p6GrJDxi-J

1O7sxqjToUD_ihr3slqjCcv6sG4o5cT7sjSzozdFPlIZkRnTXcBAHhW3ubfRQzGOToO76aEdd76UQ1KaLMnyPWKcyjHI1BI6RZn5

XoI5olMXjYkP41kU5UNxVz506jCGeEd0IHjNHc2m8AE61UHCrQqgV4l1VkVo2afkHG9bqeTXHCgsPUapEPYt5dLe32cou7fBit5Z

BDkAtLDgpWJ2Zt4KXz7DNIXE2vQFk6mJRdZ-oQfmLbedzGN4DbEAbIjDmC4-sleTcd1BzV0AEhDpWuXpBzrck8G60EZW7xCSvula

FgZYC9EyxuX2GGMk37rdECbTyOQWwJLx7zpDlgvCWC_j1CkKhg2arsjLxB7jt5FpIxizw_ky9FYbT3xo8Ek4HVHa9KTaHGWniOk9

YPmO7b1OHGrYK6hQaCIhXLOJwpxXEktZf_VvHNsuBBPo9bO6rTy6DwNyh1Ho4FYlOEtOWB6p8gatM8MqBDWtMWgk0KGcLmzpH2sQ

mMAJnbEnH2ZTwoz1L4jITpgFAQcgpUqahiQpN-WTZP3IIRKByG3cSVauASuCFIzIv2Bjrhluxew0G8JPNT9Km8mxV65k4YUR-

EmnvSse5MjjNt-Ne5Z1Zwu3uBBz1phEAGQ6L34spffRCgRj51goz6yxfJ7IUcjbj1P4Jcen0AwgJUcCz4xLzBHFqUVvICaeBV9re

5-WElUDsBwYcbqmvPU0t3bNchtHNJOhf8BFmE-YVnFVcw_Vp8WA2oU0h8Xi4_EVKKIF3P9kPsMRG-zE6yFVo2XHyqeowQDFNQnNO

FOmiL6CxkZ1NAqUSkWc6wzrLf8dU3YaRonuRqBe3XhYacmItIpqzPuwYjeX3kC2wswhUd11KvrB5WCxSbG0WMp_QAL40C1xQ5Sqc

HENLl8BDJkgIKfc7-6K-s9YaMuQJ_HrARASRaYIQwscHmwGOIJmwQhW75issn0pktUeHyJUylCsdJJfJBrSe1pNMpNCDFhYO7HAH

kH6WFWcu9wLQ6yKlG1HxjSEfQIBxTjJYgHgtPVj5c35joCJ_tq9FX4h1QDCdOt9xcyFgher7Ains2wIrCbBslzzXLiYRQ55-CzcR

70e1C9XjfmjBWLexBsbLTV3SaPx6ztNYtjgLExJdVaLaMkg4O2SgK9ZeAlyBjNv6FlR3G_EcB3wETIZMZ5I3R_Q_SrM7uR717GS_

pWvwXd8eDFXoRTnKQKMaUBhgurI8wtWvKFKXww1vor6zkH7cFIQitOVTCBByZmcLicUGWfUMOhDp-

cGnTuknQrMnlmYWdKBCtpoNaLVRxGmOrTWU-xWBEIGFvJYkgFMvlikmS-oZWIN9PRd8SOEOfOh1NNcbnjowXCoVmRmi0raYajoen

EFV0DtMlCQ7tfyVWYWxAOBpj7D_MXc_ztd-6wFLYAt0SVZB5pGFkkCM6pGJpGS4WwY5EIM3SSJM8LjHhDpy-KWede-TD_-vs3GUv

IzhnqBxpcrnv8tqJ99_Pjv76uGuTD_A_1xa7JM_8zaPf4-JWzKOyZ0VjmMMaXeD0DEtOSDm5rD_MjqCOz8VacoHYL7V1LPmpgXP2

xgj2rAP08STC2-TP_3KkhrAoU27NiavAEAcA7-1iJN__9-f6rCBOf8k7vtTo_L150kUUvT42jfplAXxiq2Y2MLe8VjNen9cLgRRU

rOeXYNXefboXbtHXCii5nJZMr8JvyvMLLjtUFuXRYlgpcKvLIjiNp-QmviJ3J4zi7G7W-hKzXTNtHGEfqb6OK59XwDS-

PKWS3D_uSKyeeQbKnyfSiOcSQaN74BlbA6Ay8ZNavdnyWRaNf8wO_LoOPiT4NJ_YmBxaY9rPFYWTOL13aBg-

BSyHT3lbaIYAjaqLMXlxtOJx3qcDINs0dlyHCc5ZpUnPQ0Ql7t4gbqQqwEh8gMzUkbsCgkfDIUr3PYkX7jJu7GOvV-JZ8ThdPVPj

brHiJYXxfzw0w9suxPImnl36g0j9wmIGyJlkeVPbSHUFboJieaHqMMmBnHZ6wHmiv_Hb4vFQgs4Ym4EaGnSkcgcqF7N6KxoGCfDw

yJewN45CcJnc3yvV_FEzY82q2v6rUnXt_Wv13c-1gzJJ_IGrSsqtu6YEpg1fDkHYwOsm_DjmpAEeoEnhKLLJdCfeuZ605zA2rBA9

zRQstLWJPWB9DS09Bj8bj3LH0zWq1HF27RJMWORlXeK2k_BDHaMIzcpmPlzqa1WilhvCjdxOC_DO23Xz__j9ZKXkN

**By submitting this issue I confirm that I am aware that this information can
potentially be used to determine what kind of calculation was performed at the
time of error.**