[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [local‑first/Protocol](https://evolu.dev/docs/api-reference/common/local-first/Protocol) › ProtocolVersionError

Defined in: [packages/common/src/local-first/Protocol.ts:421](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/local-first/Protocol.ts#L421)

Represents a version mismatch in the Evolu Protocol. Occurs when the
initiator and non-initiator are using incompatible protocol versions.

## Extends

- [`OwnerError`](https://evolu.dev/docs/api-reference/common/local-first/Owner/interfaces/OwnerError).[`Typed`](https://evolu.dev/docs/api-reference/common/Type/interfaces/Typed)\<`"ProtocolVersionError"`\>

## Properties

<a id="isinitiator"></a>

### isInitiator

```ts
readonly isInitiator: boolean;
```

Defined in: [packages/common/src/local-first/Protocol.ts:425](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/local-first/Protocol.ts#L425)

Indicates which side is obsolete and should update.

---

<a id="ownerid"></a>

### ownerId

```ts
readonly ownerId: string & Brand<"Id"> & Brand<"OwnerId">;
```

Defined in: [packages/common/src/local-first/Owner.ts:539](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/local-first/Owner.ts#L539)

#### Inherited from

[`OwnerError`](https://evolu.dev/docs/api-reference/common/local-first/Owner/interfaces/OwnerError).[`ownerId`](https://evolu.dev/docs/api-reference/common/local-first/Owner/interfaces/OwnerError#ownerid)

---

<a id="type"></a>

### type

```ts
readonly type: "ProtocolVersionError";
```

Defined in: [packages/common/src/Type.ts:11986](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Type.ts#L11986)

#### Inherited from

[`Typed`](https://evolu.dev/docs/api-reference/common/Type/interfaces/Typed).[`type`](https://evolu.dev/docs/api-reference/common/Type/interfaces/Typed#type)

---

<a id="version"></a>

### version

```ts
readonly version: number & Brand<"NonNaN"> & Brand<"Finite"> & Brand<"Int"> & Brand<"NonNegative">;
```

Defined in: [packages/common/src/local-first/Protocol.ts:423](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/local-first/Protocol.ts#L423)