diff --git a/modules/core/src/main/scala/playground/DynamicServiceProxy.scala b/modules/core/src/main/scala/playground/DynamicServiceProxy.scala
index 35209c54..b5e15479 100644
--- a/modules/core/src/main/scala/playground/DynamicServiceProxy.scala
+++ b/modules/core/src/main/scala/playground/DynamicServiceProxy.scala
@@ -50,11 +50,11 @@ class DynamicServiceProxy[Alg[_[_, _, _, _, _]], Op[_, _, _, _, _]](
           val mapOutput = makeProxy(endpointStatic.output, endpoint.output)
 
           def errorMapper[A]: Throwable => F[A] =
-            endpointStatic.errorable match {
+            endpointStatic.error match {
               case None => _.raiseError[F, A]
               case Some(errorableStatic) =>
-                val errorable = endpoint.errorable.get // should be there at this point
-                val mapError = makeProxy(errorableStatic.error, errorable.error)
+                val errorable = endpoint.error.get // should be there at this point
+                val mapError = makeProxy(errorableStatic.schema, errorable.schema)
 
                 e =>
                   errorableStatic.liftError(e) match {
diff --git a/modules/core/src/main/scala/playground/OperationCompiler.scala b/modules/core/src/main/scala/playground/OperationCompiler.scala
index 1a76e58b..631d34a8 100644
--- a/modules/core/src/main/scala/playground/OperationCompiler.scala
+++ b/modules/core/src/main/scala/playground/OperationCompiler.scala
@@ -83,7 +83,7 @@ object OperationCompiler {
 
   def fromSchemaIndex(
     dsi: DynamicSchemaIndex
-  ): OperationCompiler[Eff] = fromServices(dsi.allServices)
+  ): OperationCompiler[Eff] = fromServices(dsi.allServices.toList)
 
   def fromServices(
     services: List[DynamicSchemaIndex.ServiceWrapper]
@@ -154,7 +154,7 @@ private class ServiceCompiler[Alg[_[_, _, _, _, _]]](
   ): QueryCompiler[CompiledInput] = {
     val inputCompiler = e.input.compile(QueryCompilerVisitor.full)
     val outputEncoder = NodeEncoder.derive(e.output)
-    val errorEncoder = e.errorable.map(e => NodeEncoder.derive(e.error))
+    val errorEncoder = e.error.map(e => NodeEncoder.derive(e.schema))
 
     ast =>
       inputCompiler
diff --git a/modules/core/src/main/scala/playground/OperationRunner.scala b/modules/core/src/main/scala/playground/OperationRunner.scala
index 82b4f9a0..ed018e0c 100644
--- a/modules/core/src/main/scala/playground/OperationRunner.scala
+++ b/modules/core/src/main/scala/playground/OperationRunner.scala
@@ -147,7 +147,7 @@ object OperationRunner {
     awsEnv: Resource[F, AwsEnvironment[F]],
     plugins: List[PlaygroundPlugin],
   ): Map[QualifiedIdentifier, Resolver[F]] = forServices(
-    services = dsi.allServices,
+    services = dsi.allServices.toList,
     getSchema = dsi.getSchema,
     client = client,
     baseUri = baseUri,
diff --git a/modules/core/src/test/scala/playground/DynamicModel.scala b/modules/core/src/test/scala/playground/DynamicModel.scala
index 926e7967..543bb2f9 100644
--- a/modules/core/src/test/scala/playground/DynamicModel.scala
+++ b/modules/core/src/test/scala/playground/DynamicModel.scala
@@ -13,7 +13,7 @@ object DynamicModel {
       .assemble()
       .unwrap()
 
-    DynamicSchemaIndex.loadModel(model).toTry.get
+    DynamicSchemaIndex.loadModel(model)
   }
 
 }
diff --git a/modules/language-support/src/main/scala/playground/language/CompletionProvider.scala b/modules/language-support/src/main/scala/playground/language/CompletionProvider.scala
index e8c2b4d9..8740b3d2 100644
--- a/modules/language-support/src/main/scala/playground/language/CompletionProvider.scala
+++ b/modules/language-support/src/main/scala/playground/language/CompletionProvider.scala
@@ -31,7 +31,7 @@ object CompletionProvider {
 
   def forSchemaIndex(
     dsi: DynamicSchemaIndex
-  ): CompletionProvider = forServices(dsi.allServices)
+  ): CompletionProvider = forServices(dsi.allServices.toList)
 
   def forServices(
     allServices: List[DynamicSchemaIndex.ServiceWrapper]
diff --git a/modules/lsp/src/main/scala/playground/lsp/BuildLoader.scala b/modules/lsp/src/main/scala/playground/lsp/BuildLoader.scala
index 9231e7f9..e58f8f65 100644
--- a/modules/lsp/src/main/scala/playground/lsp/BuildLoader.scala
+++ b/modules/lsp/src/main/scala/playground/lsp/BuildLoader.scala
@@ -100,7 +100,7 @@ object BuildLoader {
         for {
           specs <- filterImports(rawImportPaths)
           model <- loadModel(specs, loaded.config)
-          dsi <- DynamicSchemaIndex.loadModel(model).liftTo[F]
+          dsi = DynamicSchemaIndex.loadModel(model)
         } yield dsi
       }
 
diff --git a/modules/lsp/src/main/scala/playground/lsp/LanguageServer.scala b/modules/lsp/src/main/scala/playground/lsp/LanguageServer.scala
index add0d3bc..9565417e 100644
--- a/modules/lsp/src/main/scala/playground/lsp/LanguageServer.scala
+++ b/modules/lsp/src/main/scala/playground/lsp/LanguageServer.scala
@@ -133,7 +133,7 @@ object LanguageServer {
 
       // see if we can pass this everywhere
       // https://github.com/kubukoz/smithy-playground/issues/164
-      val serviceIndex: ServiceIndex = ServiceIndex.fromServices(dsi.allServices)
+      val serviceIndex: ServiceIndex = ServiceIndex.fromServices(dsi.allServices.toList)
 
       val compiler: FileCompiler[IorThrow] = FileCompiler
         .instance(
diff --git a/modules/lsp/src/main/scala/playground/lsp/ServerBuilder.scala b/modules/lsp/src/main/scala/playground/lsp/ServerBuilder.scala
index fa6a8513..914a15ae 100644
--- a/modules/lsp/src/main/scala/playground/lsp/ServerBuilder.scala
+++ b/modules/lsp/src/main/scala/playground/lsp/ServerBuilder.scala
@@ -84,7 +84,7 @@ object ServerBuilder {
               plugins = plugins,
             )
 
-          val serviceIndex = ServiceIndex.fromServices(dsi.allServices)
+          val serviceIndex = ServiceIndex.fromServices(dsi.allServices.toList)
 
           implicit val sl: ServerLoader[F] = loader
 
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 51cc09bc..d567f85d 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -3,7 +3,8 @@ ThisBuild / libraryDependencySchemes += "org.scala-lang.modules" %% "scala-xml"
 addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.5.11")
 addSbtPlugin("io.github.davidgregory084" % "sbt-tpolecat" % "0.4.3")
 
-addSbtPlugin("com.disneystreaming.smithy4s" % "smithy4s-sbt-codegen" % "0.18.0-945-9e50924")
+//7b21e56392480baa1b9183ef154846d6121ebae2
+addSbtPlugin("com.disneystreaming.smithy4s" % "smithy4s-sbt-codegen" % "dev-SNAPSHOT")
 
 addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.11.0")
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.1")