Go语言-不允许导入周期

I'm struggling with a go environment I was working on, that stopped working.

No matter what I do I get this error:

import cycle not allowed
package main
    imports fmt
    imports errors
    imports runtime
    imports runtime/internal/atomic
    imports runtime

I tried just running simple code, and still not working:

package main

import "fmt"

func main() {
    fmt.Println("aaa")
}

Any suggestions? I'm clueless