I have managed to deploy the sign management solution on ArcGIS online, with a few changes. As we don't use the MUTCD codes, we had to change out the codes along with the symbols, all of which worked successfully. We tried to make some additional changes to the choice list for some of the fields and this where we have an issue. We can no longer add new signs. Modification was made to the choice list for primary colour, sign types and also sign dimensions unit(this field name was also changed to sign dimension). In the forms we also removed some field from being visible to be updated. But since then we have been unable create signs, in field maps it says 'LAYER FAILED TO LOAD'. Can anyone assist?