Bug report: Application crashed with TraitError

[cpignedoli]

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):

Not sure what I did, I was setting "molecule" for the periodicity with a molecule from the examples in the demo server

Attachments

Traceback

/opt/conda/lib/python3.9/contextlib.py in __exit__(self, typ, value, traceback)
    124         if typ is None:
    125             try:
--> 126                 next(self.gen)
    127             except StopIteration:
    128                 return False

/opt/conda/lib/python3.9/site-packages/traitlets/traitlets.py in hold_trait_notifications(self)
   1500                 for changes in cache.values():
   1501                     for change in changes:
-> 1502                         self.notify_change(change)
   1503 
   1504     def _notify_trait(self, name, old_value, new_value):

/opt/conda/lib/python3.9/site-packages/traitlets/traitlets.py in notify_change(self, change)
   1515     def notify_change(self, change):
   1516         """Notify observers of a change event"""
-> 1517         return self._notify_observers(change)
   1518 
   1519     def _notify_observers(self, event):

/opt/conda/lib/python3.9/site-packages/traitlets/traitlets.py in _notify_observers(self, event)
   1562                 c = getattr(self, c.name)
   1563 
-> 1564             c(event)
   1565 
   1566     def _add_notifiers(self, handler, name, type):

/opt/conda/lib/python3.9/site-packages/traitlets/traitlets.py in _update_target(self, change)
    368             setattr(self.target[0], self.target[1], self._transform(change.new))
    369             if getattr(self.source[0], self.source[1]) != change.new:
--> 370                 raise TraitError(
    371                     "Broken link {}: the source value changed while updating "
    372                     "the target.".format(self)

TraitError: Broken link <traitlets.traitlets.link object at 0x7fcd3cef3850>: the source value changed while updating the target.

Environment fingerprint

eNptWE1z4zYS_Ssu7TVkiaQkj3xLfEvNbLzryU5tbaVUIAlRsEAAJkDLdGr--
za6GxImlaMeQKA_Xz_oz9WbnLyyZvVQ_bRyWoSjncbVw58rMXUnFWQX5kmuHv632m1aFVY_rVZ_wL4lnKw5XD9dNeW-rBpYvUH_-
NQUv7ezCfPd85enu2-yv_utC3f1XfXpodo8bPZ3v399vKvX9Wb1HU4U3VkM0uPNSvWi6Gy8d1WXu7KGgwk8LU5Or7Oc49K6rMv1d
cl5OfcW4KrcZvDrLMCEUXo3Se_j-
gZOvK1fhDFKTvs13lX_3UpxsdP5qO3F457mtkeLNkIb8D7HDic7yr9deGW4WpdrsclXLqofZPCHVniZrhHkuC2cOgsAd-WnsiJoG
l8x7A0BWo6t6tB53mKMDSLIvggQMo_RuidbjFf1KYwad-8puGZRFs_b0dfO9WryuGNTbggZbU9R_0TnxPp4k4UT4YTwho6aBmvqo
jseVXSjSuG6wUWrTK_M4GmdQ45eN2VdkwE-BHuWhiIOVyK2mO4wSCMnEeyExlX4bQhoa_wWD_tFtFLjlxDnWJUtVFcntM6KJkLOT
sGXx9l0wVrtCz3NRSe6k8Szd-h4202LC1g2_KEUc1DHWXs7uw0uVBUa3WoJHwMC9ceAMmdJlm7jb3DphHZtyKzJBq3ckmXnMV7_a
E2YLFlbUYbRLLSSTdkgmDyHTRj9Tk5gG0YeGgsy1awTytdQfDk9YPeWfp_E5GUoDBSW0OoDjY7hxEU1dTOVUEW577TqzgBArZX36
XfhnTIGv1yXnJrOajuJUXCBbBEyvaBsUXMgUDABFCdhegjbwNXJG4KdJ3Qg1RNmxQ6TcKcIN2AXhWTpdDKBXO1lOw_87Q7D3kvgF
i6hLfvYy-PsZf8-ak4GgUAaEGQitFRdvfLng21fgBp9IJKq0pLxRI24nTLa286HCTw6uBhjtm0XV2Z9UR01D9e9hEaWJnBPbZjJ5
CiUPrxBYno2OzEV7IVAWGUC5SeGQL530kWbhwkqFK2rsTjku-ygdDm25PcROu3FW-OhvDBNYAcR7lFpqS2muYkY7tYqHJiYGw7SE
bJzK8zthsCZxgbcs0ZDgdsK5iSwjIsJ78EcvqkPCgP16zBJabQMbGiETvMozHFSEsoDk0nnqt4INCZ6rsbY0Vq1xSiDgFgRaaat1
1WYBFBPHdLi9rrsFuhVg8Sxiw4zaCGWo-jzgaOuSb4vm00OFUBPEGLt_7Ib_GGkJoTpHo-4J-OvYCHfA7gp-
yxPKvhemEFCSn2W_xfZq9SYcduvyrzA1MCU4VUvFkioZSJHAJK9xU_22I4_JH-
T_H6ZwWg5HaCxocTIUdqeFqgIrtzHeAEF_saMV-1_WAlY21CunPvsmtPcosnrHKTZColF8r-BhVuG2CM-C-
ht9XA1oI7c9pfFW9SrxFBndbkx8D0D3urkxQZBLaZz1kkgk6DLYB52md0Q51GMrWCuIWL9Is6WP4xVjBt-WJ7Ovb2QhLpnYHbP4i
gzAh5FcDqOipalVv0DWCgDjCk5rpFZRuXDbCQPz1hdI3TpksYCVHyN57qRiCax6uiHyMMZo42zDqpXXaCuQMy0nRbeo95IrB4xLp
U0ygCyBsJI5UP8ZtooL0XAxiNOMdIDNcTZrpJ62yEcoux6J1VAOwf9puSFQx6rAvhEttae0Tjwq86wwp_UmNWamUfOTE2T3cIcP6
WY0g1Zr0fiinbQXCLSrImKHMitEASMe5ZgBI5Si4zxAHh1mWB0MNhE6t2GAdsBzUJx-ky3wpgQo8KyqeMQYwy1axRf-K18d7IjWU
Ij2Q1-5o6IzjkYyFp6GOuSU7JFVIOMjXclK58U56zGY5UjfRoD6c5DpLJDZEtoh4MRo-
Rawc5JjwVWiiBpKGCxKBdMcE3DwGkOfSw7rHKHG-AcXJ5ALYeTnH2R1VDF38KiC0UcMGcVOPUNrvhoHd5DDeH80lk31Bi3fbnPoC
g5BTLPdQVk8WRhBOTS2MHMKiTM2Yxa3NJCrxNAVP-0PKrjv7-hyxtyGW7xguwmiQHIddrX1GwAzZPGXthQ87sFKD1gG0Wzcuhwff
3UXF68AAQbQhLP_JB5uhFiHfUiYb9--4oAF9UCXQfD6aYM97jry_L8r888DhpE_ikedV6Ny29Omufnz7nAdkv0jpoiJgQjugDiwz
V_NJCelmfQEFTe9-wiDkqYzpITWIM1dbYCDWzeuJOyL-KkKrQdBo7qdXESVFwkAgD4IC8r9ui_P3_5jAyx5ms-8PEU04lHvMoiCZ
g0VycJj0zPIW2oXxOWPRGINaY59n65CBaP1T1lPMPLjogmVtXuulTEpSIJ4nUcWJ_i7b5TTFWs_r2UZ5eoeo8t5OVII6pht55BMt
RfJ-FP_AzEk2SYXXJuty2pqfwJhNA8qz4FObrn1TtdSUXljYI3gs2GQ3zveCXf0vO0Lp31Ac9zA7mXqg1q6mcdRcXCmWpiZnwALi
1Ylq15AvplvPka7QBineN85aKMx0E9iE7h_NozbwFnjtDTvWU5TaAyS-d9nemmYFNSKErxt8rKJ8bmIz0X8Aw78bEkg8NrP9KfBh
Q7qDYVNImIbbJvcVHfo2zzLG_jNKIDPthj7LuIzLGSc-kJD1AYkwKoWKEmbZh7Znc8BHvg7UmxAYvc3mmsURrCIQtNGnHIrf8RoH
mXTG1fROhOvR3QQgrBpQNZxG_4Gm-4yFYakDfMMylVAHtoZlDyV56uuKIuJykpzg11OSmtg5OTslE-
XKdllS17015jxv8-oI3wIgh5LcKrLHufkDGLmIimWIB-KOdYHa1X37__H3SdVuQ=

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.