Running into an issue attempting to activate a theme.

{"type":"error.SuiteScriptError","name":"11609","message":"The file 'tmp_default-layout-account-balance.png' was not saved to the file cabinet. An unexpected error has occurred.","stack":["createError(N/error)"],"cause":{"message":"The file 'tmp_default-layout-account-balance.png' was not saved to the file cabinet. An unexpected error has occurred.","stack":["createError(N/error)","(/SuiteBundles/Bundle 374045/ExtensionMechanism.Server/Services/FileApiSS2.js:318)","E(/SuiteBundles/Bundle 374045/third_parties/underscore.js:6)","copyFiles(/SuiteBundles/Bundle 374045/ExtensionMechanism.Server/Services/FileApiSS2.js:267)","copyTmpFile(/SuiteBundles/Bundle 374045/ExtensionMechanism.Server/JobToProcess/ImpactChangesMapReduce.js:377)","map(/SuiteBundles/Bundle 374045/ExtensionMechanism.Server/JobToProcess/ImpactChangesMapReduce.js:221)"],"name":"11609"},"id":"","notifyOff":false,"userFacing":true}

This is the base theme with no customizations and no extensions. I have tried several times and each time the file that is unable to be saved is different. Has anyone seen this error or know how to resolve it?

We are seeing similar errors (changes on each activation attempt). Have logged a NS case #4409600

We are also seeing this type of error. Unfortunately, after a few activation attempts, the activation is now stuck in the 'Pending' status. We are working on submitting a case as well.

We filed a support case as well, and NS just got back to us that it is a U3 defect: Defect 642693:  SCA > Run "gulp theme:deploy --to" > Error: "file xxx was not saved to the file cabinet. An unexpected error has occurred."