Claude Code process exited with code 1

[TyinOne]

Claude-agent Version: v0.29.2
IDEA Version: 2026.1
[Claude Agent] stderr: Error handling request {
type: 'com.agentclientprotocol.rpc.JsonRpcRequest',
id: 2,
method: 'session/new',
params: {
cwd: 'E:\code\business',
mcpServers: [],
_meta: { additionalRoots: [Array] }
},
jsonrpc: '2.0'
} {
code: -32603,
message: 'Internal error',
data: { details: 'Claude Code process exited with code 1' }
}

2026-04-20 10:26:51,727 [ 7605] WARN - #c.i.m.l.a.a.c.AcpSessionLifecycleManager - Failed to initialize ACP session for chat 8fdba51d-7f90-4e6c-a81b-d0d421c9abcc, error: com.agentclientprotocol.protocol.JsonRpcException: Internal error
com.agentclientprotocol.protocol.JsonRpcException: Internal error
at com.agentclientprotocol.protocol.Protocol.handleResponse(Protocol.kt:465)
at com.agentclientprotocol.protocol.Protocol.handleIncomingMessage(Protocol.kt:366)
at com.agentclientprotocol.protocol.Protocol.access$handleIncomingMessage(Protocol.kt:122)
at com.agentclientprotocol.protocol.Protocol$start$2.invokeSuspend(Protocol.kt:172)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:34)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100)
at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:610)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runDefaultDispatcherTask(CoroutineScheduler.kt:1194)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:906)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:775)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:762)

[AndyVictors]

Have same issue by starting Claude Agent, IntelliJ IDEA 2026.1, ACP 0.30

[hypixus]

The same issue here, claude agent is not working entirely on my pc for quite a few versions already (since roughly 0.26).

[zottermedia-dk]

I also have the same issue: Failed to initialize ACP session. Error: Internal error: "Claude Code process exited with code 1"