Vaadin 8 to 14 migration . ERROR in ../target/flow-frontend/VaadinDevmodeGizmo.js Module not found - vaadin8

Question

I am trying Vaadin 8 to 14 MPR migration for which I have built a simple application which disaplys components created in Vaadin 8 and after migration to 14, I have to show them in UI.
During the Frontend compilation, I get errors as below
ERROR in ../target/flow-frontend/Flow.js
Module not found: Error: Can't resolve '#vaadin/common-frontend' in 'C:\Vaadin14\VaadinMPR\vadin-8-to-14-mpr-ui\target\flow-frontend'
# ../target/flow-frontend/Flow.js 1:0-79 77:60-75 260:8-27 270:52-67 274:56-71 277:56-71 284:52-67
# ../target/index.ts
# ./generated/vaadin.ts
ERROR in ../target/frontend/generated-flow-imports.js
Module not found: Error: Can't resolve '#vaadin/flow-frontend/ConnectionIndicator.js' in 'C:\Vaadin14\VaadinMPR\vadin-8-to-14-mpr-ui\target\frontend'
# ../target/frontend/generated-flow-imports.js 11:0-54
# ../target/index.ts
# ./generated/vaadin.ts
ERROR in ../target/flow-frontend/VaadinDevmodeGizmo.js
Module not found: Error: Can't resolve 'lit' in 'C:\Vaadin14\VaadinMPR\vadin-8-to-14-mpr-ui\target\flow-frontend'
# ../target/flow-frontend/VaadinDevmodeGizmo.js 7:0-53 123:40-50 144:15-18 1143:19-22 1146:19-22 1149:19-22 1152:19-22 1155:19-22 1160:15-19 1170:38-42 1172:14-18 1176:14-18 1190:15-19 1196:35-39 1224:86-93 1233:14-18 1254:14-18 1276:31-35 1276:108-115 1280:15-19 1292:15-19 1332:15-19 1337:39-43 1373:30-33 1374:31-34 1375:30-33 1376:32-35 1377:29-32
ERROR in ../target/flow-frontend/VaadinDevmodeGizmo.js
Module not found: Error: Can't resolve 'lit/decorators.js' in 'C:\Vaadin14\VaadinMPR\vadin-8-to-14-mpr-ui\target\flow-frontend'
# ../target/flow-frontend/VaadinDevmodeGizmo.js 8:0-59 1393:4-12 1396:4-12 1399:4-12 1402:4-12 1405:4-12 1408:4-12 1411:4-12 1414:4-12 1417:4-12 1420:4-12 1423:4-9 1426:4-9 1429:4-9 1432:4-9 1435:4-9 1438:4-9
ERROR in ../target/flow-frontend/VaadinDevmodeGizmo.js
Module not found: Error: Can't resolve 'lit/directives/class-map.js' in 'C:\Vaadin14\VaadinMPR\vadin-8-to-14-mpr-ui\target\flow-frontend'
# ../target/flow-frontend/VaadinDevmodeGizmo.js 9:0-55 1197:24-32
Child HtmlWebpackCompiler:
1 asset
Entrypoint HtmlWebpackPlugin_0 = __child-HtmlWebpackPlugin_0
[../node_modules/.pnpm/html-webpack-plugin#4.5.1_webpack#4.46.0/node_modules/html-webpack-plugin/lib/loader.js!../target/index.html] 1.17 KiB {HtmlWebpackPlugin_0} [built]
i ｢wdm｣: Failed to compile.
------------------ Frontend compilation failed. ------------------
Error from chokidar (C:\): Error: EBUSY: resource busy or locked, lstat 'C:\DumpStack.log.tmp'
Here is my pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>vadin-8-to-14-mpr-ui</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>vadin-8-to-14-mpr-ui</name>
<prerequisites>
<maven>3</maven>
</prerequisites>
<properties>
<!-- <vaadin.version>8.9.4</vaadin.version>-->
<vaadin.version>14.8.0</vaadin.version>
<vaadin.plugin.version>8.9.4</vaadin.plugin.version>
<jetty.plugin.version>9.4.43.v20210629</jetty.plugin.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<!-- If there are no local customizations, this can also be "fetch" or "cdn" -->
<vaadin.widgetset.mode>local</vaadin.widgetset.mode>
</properties>
<repositories>
<repository>
<id>vaadin-addons</id>
<url>http://maven.vaadin.com/vaadin-addons</url>
</repository>
</repositories>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-bom</artifactId>
<version>${vaadin.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-server</artifactId>
<version>8.13.3</version>
<exclusions>
<exclusion>
<groupId>org.jsoup</groupId>
<artifactId>jsoup</artifactId>
</exclusion>
<exclusion>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-elemental</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-push</artifactId>
<version>8.13.3</version>
</dependency>
<!-- <dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-client-compiled</artifactId>
</dependency>-->
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-themes</artifactId>
<version>8.7.0</version>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-core</artifactId>
<version>14.8.0</version>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>mpr-v8</artifactId>
</dependency>
<!-- External dependencies-->
0
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>flow-server</artifactId>
<version>6.0.4</version>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>flow-client</artifactId>
<version>9.0.2</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.0</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
<!-- Exclude an unnecessary file generated by the GWT compiler. -->
<packagingExcludes>WEB-INF/classes/VAADIN/widgetsets/WEB-INF/**</packagingExcludes>
</configuration>
</plugin>
<plugin>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-maven-plugin</artifactId>
<version>${vaadin.plugin.version}</version>
<executions>
<execution>
<goals>
<goal>update-theme</goal>
<goal>update-widgetset</goal>
<goal>compile</goal>
<!-- Comment out compile-theme goal to use on-the-fly theme compilation -->
<goal>compile-theme</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>com.vaadin</groupId>
<artifactId>flow-maven-plugin</artifactId>
<version>2.0.7</version>
<executions>
<execution>
<goals>
<goal>prepare-frontend</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-clean-plugin</artifactId>
<version>3.0.0</version>
<!-- Clean up also any pre-compiled themes -->
<configuration>
<filesets>
<fileset>
<directory>src/main/webapp/VAADIN/themes</directory>
<includes>
<include>**/styles.css</include>
<include>**/styles.scss.cache</include>
</includes>
</fileset>
</filesets>
</configuration>
</plugin>
<!-- The Jetty plugin allows us to easily test the development build by
running jetty:run on the command line. -->
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>${jetty.plugin.version}</version>
<configuration>
<scanIntervalSeconds>2</scanIntervalSeconds>
</configuration>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<!-- Vaadin pre-release repositories -->
<id>vaadin-prerelease</id>
<activation>
<activeByDefault>false</activeByDefault>
</activation>
<repositories>
<repository>
<id>vaadin-prereleases</id>
<url>http://maven.vaadin.com/vaadin-prereleases</url>
</repository>
<repository>
<id>vaadin-snapshots</id>
<url>https://oss.sonatype.org/content/repositories/vaadin-snapshots/</url>
<releases>
<enabled>false</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>vaadin-prereleases</id>
<url>http://maven.vaadin.com/vaadin-prereleases</url>
</pluginRepository>
<pluginRepository>
<id>vaadin-snapshots</id>
<url>https://oss.sonatype.org/content/repositories/vaadin-snapshots/</url>
<releases>
<enabled>false</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
</profile>
</profiles>
</project>
Tried following steps:
Deleted the npm modules, package.json, webpack.config.js, webpack.generated.js, target folders and ran
mvn clean package
Ran mvn clean install
Tried solutions as in the links
Cannot find module '#vaadin/flow-frontend/Flow'
https://vaadin.com/forum/thread/17762163/module-not-found#
https://vaadin.com/forum/thread/17883890/webpack-error-can-t-resolve-vaadin-flow-frontend-flow-component-renderer
Nothing helped
Can you please give me leads on how to fix it?