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How to solve the "Cannot call from this context" error?
Temporary notice: this is part of an ongoing project of transferring and splitting my canonical from Stack Overflow on common errors in Google Apps Script. As soon as the Q&As are finalized, it will be removed.
Oftentimes, when attempting to run a method on a built-in Google service from a standalone script, the runtime throws an exception that the given method cannot be run in "this context". The exact error message is always structured as follows:
Exception: Cannot call <service name>.<method name>() from this context
What is the underlying reason for the error and how to solve it?
1 answer
Meaning
This error happens on context mismatch and is specific to container-bound scripts.
The reason for the error is attempting to call a method only available in one document type (usually, getUi() as its Ui class is shared between services) from a script bound to a document of other type (i.e., DocumentApp.getUi() from a spreadsheet-bound script) or from a standalone script.
Reproducing
To get a container-bound script context mismatch error, declare and run this function in a either a standalone script or one that is container-bound to a document other than a Google Docs one:
const cannotCallFromThisContext = () => {
try {
DocumentApp.getUi();
} catch(e) {
console.log(e);
}
};
Fixing
There is no fix for the error per se other than removing all calls for container-bound methods.
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