unable to run the npm start

[kiruthika204]

this is my error so many times i'm facing this issues. i didn't know to get a solution ERROR in ./src/app/services/auth.service.ts [1] Module not found: Error: Can't resolve '../../../build/contracts/UserRegistry.json' in '/home/kiruthika/newdapp/supply-chain/src/app/services' [1] resolve '../../../build/contracts/UserRegistry.json' in '/home/kiruthika/newdapp/supply-chain/src/app/services' [1] using description file: /home/kiruthika/newdapp/supply-chain/package.json (relative path: ./src/app/services) [1] Field 'browser' doesn't contain a valid alias configuration [1] after using description file: /home/kiruthika/newdapp/supply-chain/package.json (relative path: ./src/app/services) [1] using description file: /home/kiruthika/newdapp/supply-chain/package.json (relative path: ./build/contracts/UserRegistry.json) [1] no extension [1] Field 'browser' doesn't contain a valid alias configuration [1] /home/kiruthika/newdapp/supply-chain/build/contracts/UserRegistry.json doesn't exist [1] .ts [1] Field 'browser' doesn't contain a valid alias configuration [1] /home/kiruthika/newdapp/supply-chain/build/contracts/UserRegistry.json.ts doesn't exist [1] .js [1] Field 'browser' doesn't contain a valid alias configuration [1] /home/kiruthika/newdapp/supply-chain/build/contracts/UserRegistry.json.js doesn't exist [1] as directory [1] /home/kiruthika/newdapp/supply-chain/build/contracts/UserRegistry.json doesn't exist [1] [/home/kiruthika/newdapp/supply-chain/build/contracts/UserRegistry.json] [1] [/home/kiruthika/newdapp/supply-chain/build/contracts/UserRegistry.json.ts] [1] [/home/kiruthika/newdapp/supply-chain/build/contracts/UserRegistry.json.js] [1] [/home/kiruthika/newdapp/supply-chain/build/contracts/UserRegistry.json] [1] @ ./src/app/services/auth.service.ts 13:19-72 [1] @ ./src/app/app.module.ts [1] @ ./src/main.ts [1] @ multi webpack-dev-server/client?http://localhost:4200 ./src/main.ts [1] ERROR in ./src/app/services/contract.service.ts [1] Module not found: Error: Can't resolve '../../../build/contracts/OrderRegistry.json' in '/home/kiruthika/newdapp/supply-chain/src/app/services' [1] resolve '../../../build/contracts/OrderRegistry.json' in '/home/kiruthika/newdapp/supply-chain/src/app/services' [1] using description file: /home/kiruthika/newdapp/supply-chain/package.json (relative path: ./src/app/services) [1] Field 'browser' doesn't contain a valid alias configuration [1] after using description file: /home/kiruthika/newdapp/supply-chain/package.json (relative path: ./src/app/services) [1] using description file: /home/kiruthika/newdapp/supply-chain/package.json (relative path: ./build/contracts/OrderRegistry.json) [1] no extension [1] Field 'browser' doesn't contain a valid alias configuration [1] /home/kiruthika/newdapp/supply-chain/build/contracts/OrderRegistry.json doesn't exist [1] .ts [1] Field 'browser' doesn't contain a valid alias configuration [1] /home/kiruthika/newdapp/supply-chain/build/contracts/OrderRegistry.json.ts doesn't exist [1] .js [1] Field 'browser' doesn't contain a valid alias configuration [1] /home/kiruthika/newdapp/supply-chain/build/contracts/OrderRegistry.json.js doesn't exist [1] as directory [1] /home/kiruthika/newdapp/supply-chain/build/contracts/OrderRegistry.json doesn't exist [1] [/home/kiruthika/newdapp/supply-chain/build/contracts/OrderRegistry.json] [1] [/home/kiruthika/newdapp/supply-chain/build/contracts/OrderRegistry.json.ts] [1] [/home/kiruthika/newdapp/supply-chain/build/contracts/OrderRegistry.json.js] [1] [/home/kiruthika/newdapp/supply-chain/build/contracts/OrderRegistry.json] [1] @ ./src/app/services/contract.service.ts 14:20-74 [1] @ ./src/app/app.module.ts [1] @ ./src/main.ts [1] @ multi webpack-dev-server/client?http://localhost:4200 ./src/main.ts [1] webpack failed