diff --git a/packages/lib/services/interop/InteropService.test.ts b/packages/lib/services/interop/InteropService.test.ts
index bf8076845b..eb17d606eb 100644
--- a/packages/lib/services/interop/InteropService.test.ts
+++ b/packages/lib/services/interop/InteropService.test.ts
@@ -545,8 +545,6 @@ describe('services_InteropService', function() {
 		const exportedResource = (result.items.find(i => i.type === ModelType.Resource)).object as ResourceEntity;
 		expect(exportedResource.share_id).toBe('');
 		expect(exportedResource.is_shared).toBe(0);
-
-		console.info(result.items);
 	}));
 
 	it('should allow registering new import modules', (async () => {
diff --git a/packages/lib/services/interop/InteropService.ts b/packages/lib/services/interop/InteropService.ts
index 8006a729c2..e3011f471d 100644
--- a/packages/lib/services/interop/InteropService.ts
+++ b/packages/lib/services/interop/InteropService.ts
@@ -27,19 +27,19 @@ export default class InteropService {
 		return this.instance_;
 	}
 
-	constructor() {
+	public constructor() {
 		this.eventEmitter_ = new EventEmitter();
 	}
 
-	on(eventName: string, callback: Function) {
+	public on(eventName: string, callback: Function) {
 		return this.eventEmitter_.on(eventName, callback);
 	}
 
-	off(eventName: string, callback: Function) {
+	public off(eventName: string, callback: Function) {
 		return this.eventEmitter_.removeListener(eventName, callback);
 	}
 
-	modules() {
+	public modules() {
 		if (!this.defaultModules_) {
 			const importModules: Module[] = [
 				{
@@ -156,7 +156,7 @@ export default class InteropService {
 	// or exporters, such as ENEX. In this case, the one marked as "isDefault"
 	// is returned. This is useful to auto-detect the module based on the format.
 	// For more precise matching, newModuleFromPath_ should be used.
-	findModuleByFormat_(type: ModuleType, format: string, target: FileSystemItem = null, outputFormat: ImportModuleOutputFormat = null) {
+	private findModuleByFormat_(type: ModuleType, format: string, target: FileSystemItem = null, outputFormat: ImportModuleOutputFormat = null) {
 		const modules = this.modules();
 		const matches = [];
 		for (let i = 0; i < modules.length; i++) {
@@ -203,7 +203,7 @@ export default class InteropService {
 	 * https://github.com/laurent22/joplin/pull/1795#discussion_r322379121) but
 	 * we can do it if it ever becomes necessary.
 	 */
-	newModuleByFormat_(type: ModuleType, format: string, outputFormat: ImportModuleOutputFormat = ImportModuleOutputFormat.Markdown) {
+	private newModuleByFormat_(type: ModuleType, format: string, outputFormat: ImportModuleOutputFormat = ImportModuleOutputFormat.Markdown) {
 		const moduleMetadata = this.findModuleByFormat_(type, format, null, outputFormat);
 		if (!moduleMetadata) throw new Error(_('Cannot load "%s" module for format "%s" and output "%s"', type, format, outputFormat));
 
@@ -229,7 +229,7 @@ export default class InteropService {
 	 *
 	 * https://github.com/laurent22/joplin/pull/1795#pullrequestreview-281574417
 	 */
-	newModuleFromPath_(type: ModuleType, options: any) {
+	private newModuleFromPath_(type: ModuleType, options: any) {
 		const moduleMetadata = this.findModuleByFormat_(type, options.format, options.target);
 		if (!moduleMetadata) throw new Error(_('Cannot load "%s" module for format "%s" and target "%s"', type, options.format, options.target));
 
@@ -246,32 +246,9 @@ export default class InteropService {
 		output.setMetadata({ options, ...moduleMetadata });
 
 		return output;
-
-		// let modulePath = options && options.modulePath ? options.modulePath : '';
-
-		// if (!modulePath) {
-		// 	const moduleMetadata = this.findModuleByFormat_(type, options.format, options.target);
-		// 	if (!moduleMetadata) throw new Error(_('Cannot load "%s" module for format "%s" and target "%s"', type, options.format, options.target));
-		// 	modulePath = this.modulePath(moduleMetadata);
-		// }
-
-		// const moduleMetadata = this.findModuleByFormat_(type, options.format, options.target);
-
-		// let output = null;
-
-		// if (moduleMetadata.isCustom) {
-		// 	output = this.newModuleFromCustomFactory(moduleMetadata);
-		// } else {
-		// 	const ModuleClass = shim.requireDynamic(modulePath).default;
-		// 	output = new ModuleClass();
-		// }
-
-		// output.setMetadata({ options, ...moduleMetadata });
-
-		// return output;
 	}
 
-	moduleByFileExtension_(type: ModuleType, ext: string) {
+	private moduleByFileExtension_(type: ModuleType, ext: string) {
 		ext = ext.toLowerCase();
 
 		const modules = this.modules();
diff --git a/packages/server/src/models/UserModel.ts b/packages/server/src/models/UserModel.ts
index 002cf348fd..7f14378746 100644
--- a/packages/server/src/models/UserModel.ts
+++ b/packages/server/src/models/UserModel.ts
@@ -1,7 +1,7 @@
 import BaseModel, { AclAction, SaveOptions, ValidateOptions } from './BaseModel';
 import { EmailSender, Item, NotificationLevel, Subscription, User, UserFlagType, Uuid } from '../services/database/types';
 import * as auth from '../utils/auth';
-import { ErrorUnprocessableEntity, ErrorForbidden, ErrorPayloadTooLarge, ErrorNotFound } from '../utils/errors';
+import { ErrorUnprocessableEntity, ErrorForbidden, ErrorPayloadTooLarge, ErrorNotFound, ErrorBadRequest } from '../utils/errors';
 import { ModelType } from '@joplin/lib/BaseModel';
 import { _ } from '@joplin/lib/locale';
 import { formatBytes, GB, MB } from '../utils/bytes';
@@ -600,7 +600,12 @@ export default class UserModel extends BaseModel<User> {
 
 	private async syncInfo(userId: Uuid): Promise<any> {
 		const item = await this.models().item().loadByName(userId, 'info.json');
-		if (!item) throw new Error('Cannot find info.json file');
+
+		// We can get there if user 1 tries to share a notebook with user 2, but
+		// user 2 has never initiated a sync. In this case, they won't have the
+		// info.json file that we need, so we try to return an error message
+		// that makes sense.
+		if (!item) throw new ErrorBadRequest('The account of this user is not correctly initialised (missing info.json)');
 		const withContent = await this.models().item().loadWithContent(item.id);
 		return JSON.parse(withContent.content.toString());
 	}