diff --git a/dist/modules/app/AppController.js b/dist/modules/app/AppController.js
index f43bce45..92a78772 100644
--- a/dist/modules/app/AppController.js
+++ b/dist/modules/app/AppController.js
@@ -9,6 +9,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
     });
 };
 Object.defineProperty(exports, "__esModule", { value: true });
+exports.AppController = void 0;
 const fs_1 = require("fs");
 const path_1 = require("path");
 const util_1 = require("util");
@@ -229,10 +230,10 @@ class AppController {
                             hasErrors = true;
                             this.showException(err, options, cli);
                         }
-                        for (let file of files) {
+                        for (let file of files || []) {
                             cli.newLine(cli.symbolSuccess, 'Generated script', cli.colorHighlight(file));
                         }
-                        for (let err of errors) {
+                        for (let err of errors || []) {
                             // cli.newLine( cli.symbolError, err.message );
                             this.showException(err, options, cli);
                         }
diff --git a/dist/modules/plugin/PluginController.js b/dist/modules/plugin/PluginController.js
index 5b89449e..12c11f60 100644
--- a/dist/modules/plugin/PluginController.js
+++ b/dist/modules/plugin/PluginController.js
@@ -9,6 +9,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
     });
 };
 Object.defineProperty(exports, "__esModule", { value: true });
+exports.PluginController = void 0;
 const PluginDrawer_1 = require("./PluginDrawer");
 const PluginManager_1 = require("./PluginManager");
 const PackageBasedPluginFinder_1 = require("./PackageBasedPluginFinder");
diff --git a/dist/modules/plugin/PluginManager.js b/dist/modules/plugin/PluginManager.js
index 82509a0d..d6ce7026 100644
--- a/dist/modules/plugin/PluginManager.js
+++ b/dist/modules/plugin/PluginManager.js
@@ -9,12 +9,13 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
     });
 };
 Object.defineProperty(exports, "__esModule", { value: true });
+exports.PluginManager = void 0;
 const childProcess = require("child_process");
-const inquirer = require("inquirer");
 const fs = require("fs");
+const inquirer = require("inquirer");
 const path_1 = require("path");
-const PluginData_1 = require("./PluginData");
 const read_file_1 = require("../util/read-file");
+const PluginData_1 = require("./PluginData");
 /**
  * Plug-in manager
  *
@@ -103,7 +104,8 @@ class PluginManager {
             }
             // Install the plug-in as a DEVELOPMENT dependency using NPM
             const PACKAGE_MANAGER = 'NPM';
-            const INSTALL_DEV_CMD = 'npm install --save-dev ' + name + ' --color=always';
+            // App @1 to install only plugins compatible with Concordia 1.x
+            const INSTALL_DEV_CMD = 'npm install --save-dev ' + name + '@1 --no-fund --no-audit --loglevel error --color=always';
             drawer.showMessageTryingToInstall(name, PACKAGE_MANAGER);
             const code = yield this.runCommand(INSTALL_DEV_CMD);
             drawer.showCommandCode(code, false);
@@ -130,7 +132,7 @@ class PluginManager {
             }
             // Remove with a package manager
             drawer.showMessageTryingToUninstall(name, 'NPM');
-            let code = yield this.runCommand('npm uninstall --save-dev ' + name + ' --color=always');
+            let code = yield this.runCommand('npm uninstall --save-dev ' + name + ' --no-fund --no-audit --color=always');
             drawer.showCommandCode(code);
         });
     }
diff --git a/modules/app/AppController.ts b/modules/app/AppController.ts
index 0e901008..300917c2 100644
--- a/modules/app/AppController.ts
+++ b/modules/app/AppController.ts
@@ -262,11 +262,11 @@ export class AppController {
                         this.showException( err, options, cli );
                     }
 
-                    for ( let file of files ) {
+                    for ( let file of files || [] ) {
                         cli.newLine( cli.symbolSuccess, 'Generated script', cli.colorHighlight( file ) );
                     }
 
-                    for ( let err of errors ) {
+                    for ( let err of errors || [] ) {
                         // cli.newLine( cli.symbolError, err.message );
                         this.showException( err, options, cli );
                     }
@@ -355,4 +355,4 @@ export class AppController {
         return "\n  DETAILS: " + err.stack.substring( err.stack.indexOf( "\n" ) );
     }
 
-}
\ No newline at end of file
+}
diff --git a/modules/dbi/DatabaseInterface.ts b/modules/dbi/DatabaseInterface.ts
index 3b7b2db7..a7c6659d 100644
--- a/modules/dbi/DatabaseInterface.ts
+++ b/modules/dbi/DatabaseInterface.ts
@@ -1,6 +1,6 @@
 import { Database } from "../ast/Database";
 import { Queryable } from "./Queryable";
-import { Table } from "modules/ast";
+import { Table } from "../ast/Table";
 
 /**
  * Database interface
@@ -56,4 +56,4 @@ export interface DatabaseInterface extends Queryable {
 
     /// @see more methods in Queryable
 
-}
\ No newline at end of file
+}
diff --git a/modules/plugin/PluginController.ts b/modules/plugin/PluginController.ts
index 31fffb67..822ac02a 100644
--- a/modules/plugin/PluginController.ts
+++ b/modules/plugin/PluginController.ts
@@ -79,4 +79,4 @@ export class PluginController {
         return true;
     };
 
-}
\ No newline at end of file
+}
diff --git a/modules/plugin/PluginManager.ts b/modules/plugin/PluginManager.ts
index b08adc25..09eefbaa 100644
--- a/modules/plugin/PluginManager.ts
+++ b/modules/plugin/PluginManager.ts
@@ -1,13 +1,14 @@
 import * as childProcess from 'child_process';
-import * as inquirer from 'inquirer';
+import { Plugin } from 'concordialang-plugin';
 import * as fs from 'fs';
+import * as inquirer from 'inquirer';
 import { join } from 'path';
-import { Plugin } from "concordialang-plugin";
-import { CLI } from 'modules/app/CLI';
-import { PluginData, PLUGIN_PREFIX } from "./PluginData";
-import { PluginDrawer } from "./PluginDrawer";
-import { PluginFinder } from "./PluginFinder";
+
+import { CLI } from '../app/CLI';
 import { readFileAsync } from '../util/read-file';
+import { PLUGIN_PREFIX, PluginData } from './PluginData';
+import { PluginDrawer } from './PluginDrawer';
+import { PluginFinder } from './PluginFinder';
 
 /**
  * Plug-in manager
@@ -122,8 +123,9 @@ export class PluginManager {
 
         // Install the plug-in as a DEVELOPMENT dependency using NPM
 
-        const PACKAGE_MANAGER = 'NPM';
-        const INSTALL_DEV_CMD = 'npm install --save-dev ' + name + ' --color=always';
+		const PACKAGE_MANAGER = 'NPM';
+		// App @1 to install only plugins compatible with Concordia 1.x
+        const INSTALL_DEV_CMD = 'npm install --save-dev ' + name + '@1 --no-fund --no-audit --loglevel error --color=always';
 
         drawer.showMessageTryingToInstall( name, PACKAGE_MANAGER );
         const code: number = await this.runCommand( INSTALL_DEV_CMD );
@@ -156,7 +158,7 @@ export class PluginManager {
 
         // Remove with a package manager
         drawer.showMessageTryingToUninstall( name, 'NPM' );
-        let code: number = await this.runCommand( 'npm uninstall --save-dev ' + name + ' --color=always' );
+        let code: number = await this.runCommand( 'npm uninstall --save-dev ' + name + ' --no-fund --no-audit --color=always' );
         drawer.showCommandCode( code );
     }
 
@@ -255,4 +257,4 @@ export class PluginManager {
         return new context[ className ]( ... args );
     }
 
-}
\ No newline at end of file
+}