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if you use MR script to create / save files, test it on RP. there is a defect for version 2.x or 2.1

<@UNJNU4RT8> Could you share what you're seeing?

hi Ashwin, it is already fixed yesterday.

Hi Ashwin, we are now experiencing the problem on Production

it was OK in the morning for over 200 tests. Now 6 over 23 tests failed

```{
	"type": "error.SuiteScriptError",
	"name": "SyntaxError",
	"message": "Invalid quantifier ?",
	"stack": ["createError(N/error)"],
	"cause": {
		"message": "Invalid quantifier ?",
		"fileName": "/SuiteScripts/Generic Customizations/mr_file_test.js",
		"lineNumber": 30,
		"name": "SyntaxError",
		"stack": "\tat /SuiteScripts/Generic Customizations/mr_file_test.js:30 (reduce)\n\tat INVOCATION_WRAPPER$sys:75\n\tat INVOCATION_WRAPPER$sys:23\n\tat INVOCATION_WRAPPER$sys:111\n\tat INVOCATION_WRAPPER$sys:4\n",
		"rhinoException": "org.mozilla.javascript.EcmaError: SyntaxError: Invalid quantifier ? (/SuiteScripts/Generic Customizations/mr_file_test.js#30)"
	},
	"id": "",
	"notifyOff": false,
	"userFacing": true
}```

My script code is

`/**`
 `* @NApiVersion 2.x`
 `* @NModuleScope Public`
 `* @NScriptType MapReduceScript`
 `*`
 `* @author Selcuk Dogru`
 `*`
 `* @module N/file`
 `* @module N/task`
 `*`
 `* @description`
 `*/`
`define(['N/file', 'N/task'],`
	`function (file, task) {`

	`function getInputData(inputContext) {`
		`return [1];`
	`}`

	`function reduce(reduceContext) {`
		`var fileObj = file.create({`
				`name: 'cs_test1.txt',`
				`fileType: file.Type.PLAINTEXT,`
				`contents: 'whatever',`
				`folder: 1836989`
			`});`

		`var fileId = fileObj.save();`
		`file.delete({`
			`id: fileId`
		`});`
	`}`

	`function summarize(summary) {`
		`summary.reduceSummary.errors.iterator().each(function (key, error) {`
			`log.error('Reduce Error for key: ' + key, error);`
			`return true;`
		`});`

		`var sTask = task.create({`
				`taskType: task.TaskType.MAP_REDUCE,`
				`scriptId: 'customscript1888',`
				`deploymentId: 'customdeploy1'`
			`});`
		`sTask.submit();`
	`}`
	`return {`
		`config: {`
			`retryCount: 2,`
			`exitOnError: false`
		`},`
		`getInputData: getInputData,`
		`reduce: reduce,`
		`summarize: summarize`
	`};`
`});`

Do you get this error when you save this file in FC?

if I change script version to 2.1, it happens during file.create

another finding I've is, doesn't matter how many file operations you've in the script, it fails for all or none during a single run

can it be based on the load on the server, libraries or operation routed to different server hence the behavior?