Import cycle not allowed

Here is an illustration of your first import cycle problem.

                  project/controllers/account
                     ^                    \    
                    /                      \
                   /                        \ 
                  /                         \/
         project/components/mux <--- project/controllers/base
            
                   

As you can see with my bad ASCII chart, you are creating an import cycle when project/components/mux imports project/controllers/account. Since Go does not support circular dependencies you get the import cycle not allowed error during compile time.

I just encountered this. You may be accessing a method/type from within the same package using the package name itself.

Here is an example to illustrate what I mean:

In foo.go:

// foo.go
package foo

func Foo() {...}

In foo_test.go:

// foo_test.go
package foo

// try to access Foo()
foo.Foo() // WRONG <== This was the issue. You are already in package foo, there is no need to use foo.Foo() to access Foo()
Foo() // CORRECT

Another common cause of circular dependency is shown in this answer.

Unlike JavaScript, Go has low tolerance for circular dependencies, which is both a good and a bad thing.