Minus issue with angular

[aaqeel87]

Hi, getting an error when running Angular! tried the older version 7.1.0 but still got too many error. the 'minus' is the least error am getting.
package working on is 'thismypc-0.3.4'

Package Version

@angular-devkit/architect 0.1200.2
@angular-devkit/build-angular 12.0.2
@angular-devkit/core 12.0.2
@angular-devkit/schematics 12.0.2
@angular/cli 12.0.2
@angular/compiler-cli 12.0.2
@schematics/angular 12.0.2
rxjs 6.3.3
typescript 3.1.6

C:\Users{user}.\Project\thismypc-0.3.4\thisMyPCWeb>ng test
An unhandled exception occurred: Cannot read property 'Minus' of undefined
See "C:\Users\analysis\AppData\Local\Temp\ng-AepcSz\angular-errors.log" for further details.