Go raises the “fatal error: concurrent map read and map write” error when multiple goroutines are trying to read and write to the same map simultaneously. This can lead to data races and undefined behavior, so Go’s runtime detects this situation and raises a panic. To fix the fatal error: concurrent map read and map write error, … Read more
To assign multiple return value function to new and old variables in Go, you can use the short variable declaration syntax (:=) for new variables and regular assignment (=) for existing ones. The := operator is used to simultaneously declare and assign a variable. Example package main import “fmt” func main() { a, b := … Read more
Go raises the error “protoc-gen-go-grpc: program not found or is not executable,” occurs when the protoc compiler cannot find the protoc-gen-go-grpc plugin in your system’s PATH. This plugin is required to generate gRPC code for using Protocol Buffers. To fix the protoc-gen-go-grpc: program not found or is not executable error in Golang, Install the protoc-gen-go-grpc … Read more
The fatal error: all goroutines are asleep error occurs in Go when you have a deadlock situation. This can happen when a goroutine is waiting for a channel to receive data, but there is no other goroutine sending data to that channel. A deadlock occurs when two or more goroutines are waiting for each other to … Read more
Golang raises json: cannot unmarshal object into Go struct field error when you are trying to unmarshal JSON data into a Go struct, and there’s a mismatch between the JSON data and the Go struct definition. The error message “json: cannot unmarshal object into Go value of type” means that the JSON object cannot be unmarshaled … Read more
The go test flag: flag provided but not defined error is raised when you’ve provided a command-line flag to go test that it doesn’t recognize. This error message usually occurs when you try to use a flag that has not been defined. One possible reason for this error is that you are using an outdated version … Read more
The go get: warning: modules disabled by GO111MODULE=auto in GOPATH/src warning is raised when you encounter related to the Go module system and your GOPATH. Starting from Go 1.16, Go modules are enabled by default, but your current setup seems to have GO111MODULE set to auto. When set to auto, Go uses the old GOPATH mode … Read more
Go raises panic: runtime error: index out of range when you try to access an element in a slice or an array using an index that is either less than 0 or greater than or equal to the length of the slice/array. package main import “fmt” func main() { numbers := []int{1, 2, 3} fmt.Println(numbers[3]) } … Read more
The panic: sql: unknown driver “postgres” occurs in Go when you try to use the “postgres” driver in your SQL-related code, but the driver cannot be found. This is likely because the PostgreSQL driver for your programming language has not been installed or imported correctly. To fix the panic: sql: unknown driver “postgres”, you need to … Read more
Go raises the “cannot type switch on non-interface value” error when you try to use a type switch on a value that is not an interface. To fix the “cannot type switch on non-interface value” error, you must ensure that the value you use in the type switch is an interface. In Go, you can … Read more