[Home](./index.md) > [sip.js](./sip.js.md) > [StateTransitionError](./sip.js.statetransitionerror.md) > [(constructor)](./sip.js.statetransitionerror._constructor_.md) ## StateTransitionError.(constructor) Constructs a new instance of the `StateTransitionError` class Signature: ```typescript constructor(message?: string); ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | message | string | |