Fix build error.

statemachine.base/build.gradle

@@ -62,8 +62,8 @@ jar {
     }
 }
 
-def relastFiles = fileTree('src/main/jastadd/') { include '**/*.relast' } +
-        fileTree('src/gen/jastadd/') { include '**/*.relast' }
+def ecoreFile = "./src/main/resources/StateMachine.ecore"
+def relastFile = "./src/gen/jastadd/StateMachine.relast"
 String[] relastArguments = [
         "../libs/relast.jar",
         "--grammarName=./src/gen/jastadd/StateMachine",
@@ -73,8 +73,6 @@ String[] relastArguments = [
         "--resolverHelper",
         "--file"
 ]
-def ecoreFile = "./src/main/resources/StateMachine.ecore"
-def relastFile = "./src/gen/jastadd/StateMachine.relast"
 
 task ecoreToRelast(type: JavaExec) {
     group = 'Build'
@@ -96,9 +94,9 @@ task preprocess(type: JavaExec) {
     group = 'Build'
     main = "-jar"
 
-    args relastArguments + relastFiles
+    args relastArguments + relastFile
 
-    inputs.files relastFiles
+    inputs.files relastFile
     outputs.files file("./src/gen/jastadd/StateMachine.ast"), file("./src/gen/jastadd/StateMachine.jadd")
 }