{"record":{"id":"fdeee637487c22d3","repo":"bevyengine/bevy","slug":"expected-an-argument-but-received-none","errorCode":null,"errorMessage":"expected an argument but received none","messagePattern":"expected an argument but received none","errorType":"exception","errorClass":"ArgError","httpStatus":null,"severity":"error","filePath":"crates/bevy_reflect/src/func/args/error.rs","lineNumber":35,"sourceCode":"        /// Expected argument type path.\n        expected: Cow<'static, str>,\n        /// Received argument type path.\n        received: Cow<'static, str>,\n    },\n    /// The argument has the wrong ownership.\n    #[error(\"expected {expected} value but received {received} value (@ argument index {index})\")]\n    InvalidOwnership {\n        /// Argument index.\n        index: usize,\n        /// Expected ownership.\n        expected: Ownership,\n        /// Received ownership.\n        received: Ownership,\n    },\n    /// Occurs when attempting to access an argument from an empty [`ArgList`].\n    ///\n    /// [`ArgList`]: crate::func::args::ArgList\n    #[error(\"expected an argument but received none\")]\n    EmptyArgList,\n}\n\n/// The given argument count is out of bounds.\n#[derive(Debug, Error, PartialEq)]\n#[error(\"argument count out of bounds: {0}\")]\npub struct ArgCountOutOfBoundsError(pub usize);\n","sourceCodeStart":17,"sourceCodeEnd":43,"githubUrl":"https://github.com/bevyengine/bevy/blob/396ca727080776bd313bb892423b7d94e03b81b4/crates/bevy_reflect/src/func/args/error.rs#L17-L43","documentation":"Occurs when an empty ArgList is accessed: the caller attempts to retrieve or parse an argument when no arguments remain. It is the empty-list guard for reflected function argument access, meaning the function was invoked (or its args inspected) with fewer arguments than the code tried to read.","triggerScenarios":"Thrown at crates/bevy_reflect/src/func/args/error.rs:35 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Provide the arguments required by the function's signature","Check the ArgList length before calling"],"exampleFix":null,"handlingStrategy":"validation","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"396ca727080776bd313bb892423b7d94e03b81b4","analyzedAt":"2026-08-20T16:12:39.808Z","contentChangedAt":"2026-08-20T16:12:39.808Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}