Error map

not enough / too many arguments in call Go: not enough arguments in call to f have (int) want (int, string)

Go · layer 4, Application & API

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4 · Application & API 6 · Platform & cloud
not enough / too many arguments in call — Go: not enough arguments in call to f have (int) want (int, string) (Go)not enough …undefined: x — Go: ./main.go:12:2: undefined: handler (Go)undefined: xcannot assign to struct field m[k].f in map — Go: cannot assign to struct field users["bob"].Age in map (Go)cannot assign to st…cannot use x as type in assignment/argument — Go: cannot use "5" (untyped string constant) as int value in argument to f (Go)cannot use x as typ…function main is undeclared in the main package — Go: runtime.main_main·f: function main is undeclared in the main package (Go)function main is un…does not implement interface (missing method) — Go: cannot use &Dog{} (value of type *Dog) as Animal value: *Dog does not implement Animal (missing method Speak) (Go)does not implement …assignment mismatch: 1 variable but f returns 2 values — Go: assignment mismatch: 1 variable but os.Open returns 2 values (Go)assignment mismatch…import cycle not allowed — Go: package app/models imports app/utils imports app/models: import cycle not allowed (Go)import cycle not al…imported and not used — Go: ./main.go:5:2: "os" imported and not used (Go)imported and not us…no new variables on left side of := — Go: ./main.go:9:6: no new variables on left side of := (Go)no new variables on…cannot refer to unexported name — Go: cannot refer to unexported name pkg.helper (undefined: pkg.helper) (Go)cannot refer to une…missing return — Go: ./main.go:18:1: missing return (Go)missing returninvalid operation: mismatched types — Go: invalid operation: a + b (mismatched types int and float64) (Go)invalid operation: …syntax error: unexpected newline — Go: ./main.go:8:2: syntax error: unexpected newline, expected comma or ) (Go)syntax error: unexp…E0308 — Rust: error[E0308]: mismatched types — expected `X`, found `Y` (Rust)E0308sql: no rows in result set — Go: sql: no rows in result set (Go)sql: no rows in res…COPY failed — COPY failed: file not found in build context / "/app/x": not found (Docker)COPY faileddid not complete successfully — failed to solve: process "/bin/sh -c ..." did not complete successfully: exit code: 1 (Docker)did not complete su…failed to read dockerfile — failed to solve: failed to read dockerfile: open Dockerfile: no such file or directory (Docker)failed to read dock…panic: interface conversion — Go: panic: interface conversion: interface {} is string, not int (Go)panic: interface co…context deadline exceeded — Go: Get "https://api.example.com": context deadline exceeded (Client.Timeout exceeded while awaiting headers) (Go)context deadline ex…context canceled — Go: context canceled (rpc error: code = Canceled desc = context canceled) (Go)context canceledjson: cannot unmarshal string into Go struct field — Go: json: cannot unmarshal string into Go struct field User.age of type int (Go)json: cannot unmars…cannot find package in any of GOROOT / GOPATH — Go: cannot find package "github.com/pkg/errors" in any of: /usr/local/go/src/github.com/pkg/errors (from $GOROOT) /go/src/github.com/pkg/errors (from $GOPATH) (Go)cannot find package…no required module provides package — Go: no required module provides package github.com/foo/bar; to add it: go get github.com/foo/bar (Go)no required module …

Directly related (7)

undefined: xGo

Go: ./main.go:12:2: undefined: handler

The compiler cannot find an identifier — a typo, a missing import, or it lives in another file/package that wasn't built.

cannot assign to struct field m[k].f in mapGo

Go: cannot assign to struct field users["bob"].Age in map

Map values are not addressable, so you cannot modify a field of a struct stored directly in a map.

cannot use x as type in assignment/argumentGo

Go: cannot use "5" (untyped string constant) as int value in argument to f

A value's type is not assignable to the type required by the variable, parameter or return value.

function main is undeclared in the main packageGo

Go: runtime.main_main·f: function main is undeclared in the main package

The package is named `main` but contains no `func main()`, or you tried to build a library as an executable.

does not implement interface (missing method)Go

Go: cannot use &Dog{} (value of type *Dog) as Animal value: *Dog does not implement Animal (missing method Speak)

A type was used as an interface but lacks a method or has it with a different signature or receiver type.

assignment mismatch: 1 variable but f returns 2 valuesGo

Go: assignment mismatch: 1 variable but os.Open returns 2 values

The number of variables on the left does not match the number of values the function returns.

import cycle not allowedGo

Go: package app/models imports app/utils imports app/models: import cycle not allowed

Two or more packages import each other directly or indirectly, which Go forbids.

Two steps away (17)

imported and not usedGo

Go: ./main.go:5:2: "os" imported and not used

The file imports a package that no code in that file uses; Go treats this as a compile error, not a warning.

no new variables on left side of :=Go

Go: ./main.go:9:6: no new variables on left side of :=

`:=` declares variables, but all names on the left already exist in the same scope.

cannot refer to unexported nameGo

Go: cannot refer to unexported name pkg.helper (undefined: pkg.helper)

You used a lowercase (unexported) identifier from another package; only capitalised names are visible outside their package.

missing returnGo

Go: ./main.go:18:1: missing return

A function with a return type can reach its end without a return statement on some path.

invalid operation: mismatched typesGo

Go: invalid operation: a + b (mismatched types int and float64)

You combined two values of different types; Go never converts numeric types implicitly.

syntax error: unexpected newlineGo

Go: ./main.go:8:2: syntax error: unexpected newline, expected comma or )

The parser met a line break where it needed more tokens, usually a missing trailing comma in a multi-line literal or a misplaced…

E0308Rust

Rust: error[E0308]: mismatched types — expected `X`, found `Y`

A value’s type doesn’t match what the context expects — common with &str vs String, Option/Result vs plain values, and integer ty…

sql: no rows in result setGo

Go: sql: no rows in result set

`QueryRow(...).Scan(...)` found no row for the query.

COPY failedDocker

COPY failed: file not found in build context / "/app/x": not found

The Dockerfile COPY refers to a path outside the build context, excluded by .dockerignore, or relative to the wrong directory.

did not complete successfullyDocker

failed to solve: process "/bin/sh -c ..." did not complete successfully: exit code: 1

A RUN step in your Dockerfile failed. The real error is printed in the lines just above this message.

failed to read dockerfileDocker

failed to solve: failed to read dockerfile: open Dockerfile: no such file or directory

docker build can’t find a Dockerfile in the build context you passed.

panic: interface conversionGo

Go: panic: interface conversion: interface {} is string, not int

A type assertion `x.(T)` failed because the dynamic type of the interface is not T.

context deadline exceededGo

Go: Get "https://api.example.com": context deadline exceeded (Client.Timeout exceeded while awaiting headers)

An operation did not finish before its context deadline or HTTP client timeout.

context canceledGo

Go: context canceled (rpc error: code = Canceled desc = context canceled)

The context was cancelled before the operation finished — the caller gave up, the client disconnected, or a parent was cancelled.

json: cannot unmarshal string into Go struct fieldGo

Go: json: cannot unmarshal string into Go struct field User.age of type int

The JSON value's type does not match the Go field type (string vs number, object vs array).

cannot find package in any of GOROOT / GOPATHGo

Go: cannot find package "github.com/pkg/errors" in any of: /usr/local/go/src/github.com/pkg/errors (from $GOROOT) /go/src/github.com/pkg/errors (from $GOPATH)

Go could not locate an imported package — it is not downloaded, the module is not initialised, or GOPATH mode is in effect.

no required module provides packageGo

Go: no required module provides package github.com/foo/bar; to add it: go get github.com/foo/bar

The code imports a package whose module is not listed in `go.mod`.

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