Unable to load "MASS" package - mass

I am getting an error while loading "MASS" packages in R. It says,
Package ‘MASS’ version 7.3.57 cannot be unloaded:
Error in unloadNamespace(package) : namespace ‘MASS’ is imported by ‘lme4’, ‘RcmdrMisc’ so cannot be unloaded
I would appreciate if anybody could help me with that

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Module not found: Error: Package path ./compat is not exported from package

I'm working on my project and all of a sudden, I got the following message from the compiler and don't know how to solve the problem:
ERROR in ./src/frontend/service/AuthService.ts 8:0-39
Module not found: Error: Package path ./compat is not exported from package /Users/chuben/Desktop/Coding_Projects/ecommerce-react-node/final.frontend.project/node_modules/firebase (see exports field in /Users/chuben/Desktop/Coding_Projects/ecommerce-react-node/final.frontend.project/node_modules/firebase/package.json)
ERROR in ./src/frontend/ui/page/RegisterPage/index.tsx 14:0-39
Module not found: Error: Package path ./compat is not exported from package /Users/chuben/Desktop/Coding_Projects/ecommerce-react-node/final.frontend.project/node_modules/firebase (see exports field in /Users/chuben/Desktop/Coding_Projects/ecommerce-react-node/final.frontend.project/node_modules/firebase/package.json)
I don't understand what the problem is and how should I export the path correctly? I will really appreciate anyone who can help solve this problem. Thanks in advance!
Hopefully, I don't have to do everything from scratch by starting a new project.
I found the issue there. I shouldn't set the following in my React page, or else the system will try to search the module for the variable or sth.
const [firebaseUid,setFirebaseUid]=useState<String|undefined>(undefined);

Failed to compile. ./src/scss/style.scss ParserError: Syntax Error at line: 1, column 39

I'm trying to run a build to react app so I can deploy it to Netlify, however each time I'm getting this error and I don't know where it comes from or how can I solve it, I think the issue comes from the library it self because I comment the importing of its SCSS files it complies fineenter image description here
please advise me what can I do to solve this?

error trying to load the config "relay" for the macro imported from "babel-plugin-relay/macro"

We are trying to upgrade our react project to latest packages including relay (7.0.0). Our application builds and works but we are getting this error message in the console (during build) on every file where we import graphql from 'babel-plugin-relay/macro'. We are doing exactly like documented here adding relay
The error is "There was an error trying to load the config "relay" for the macro imported from "babel-plugin-relay/macro. Please see the error thrown for more information." It is coming from \node_modules\babel-plugin-macros\dist\index.js in getConfig( ).
To understand how other projects were configured, I downloaded another sample relay project / installed it and it had the same problem. Interesting enough there was this recent post in that app's issues list error loading config
The solution noted worked for me (adding that noted .babel-plugin-macrosrc.yml file with empty relay plugin?) but I am not understanding why this is needed or what was causing this seemingly benign error message?

prism5 wpf View-Switching Navigation QuickStart demo doesn't run

I'm new to PRISM, and downloaded the quickstart demos, and tried the View Switching Navigation.
i could build the solution, there is no error there, but when i try to run the application it gives error that cannot load CalendarModule.dll.
An unhandled exception of type 'Microsoft.Practices.Prism.Modularity.ModuleTypeLoadingException' occurred in Microsoft.Practices.Prism.Composition.dll
Additional information: Failed to load type for module CalendarModule.
Error was: Could not load file or assembly 'ViewSwitchingNavigation.Calendar.dll' or one of its dependencies. The system cannot find the path specified.
i've got this error at bootstrapper.run()
thanks for any hint!

Couldn't find or load main class org.sonar.runner.Main

I have installed sonar but when I want to analyze a project using sonar runner, I get the following error:
Error: Couldn't find or load main class org.sonar.runner.Main
The directory in which I have installed doesn't contain any spaces, So the possibility of getting this error due to wrong naming is ruled out.
Plz help me.

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