ParseException while CubaWebScssThemeCreation

Hello dear Support Team and Forum Members,

how can I fix following issue, what is the root cause or how can I figure the affected resource?

Task :app-web:buildScssThemes 
Apr 18, 2018 8:45:04 AM com.vaadin.sass.internal.tree.MixinNode traverse
SCHWERWIEGEND: null
com.vaadin.sass.internal.parser.ParseException: Substitution error: some actual parameters were not used. Formal parameters: FormalArgumentList[$anim: null], actual parameters: Actual argument list [ArgumentList [v-progress-wait 5s forwards, v-progress-wait 4s infinite backwards]] at line -1, column -1
        at com.vaadin.sass.internal.parser.FormalArgumentList.replaceFormalArguments(FormalArgumentList.java:140)
        at com.vaadin.sass.internal.tree.DefNode.replacePossibleArguments(DefNode.java:73)
        at com.vaadin.sass.internal.visitor.MixinNodeHandler.replaceMixinNode(MixinNodeHandler.java:56)
        at com.vaadin.sass.internal.visitor.MixinNodeHandler.replaceMixins(MixinNodeHandler.java:46)
        at com.vaadin.sass.internal.visitor.MixinNodeHandler.traverse(MixinNodeHandler.java:35)
        at com.vaadin.sass.internal.tree.MixinNode.traverse(MixinNode.java:116)
        at com.vaadin.sass.internal.visitor.BlockNodeHandler.traverse(BlockNodeHandler.java:69)
        at com.vaadin.sass.internal.tree.BlockNode.traverse(BlockNode.java:120)
        at com.vaadin.sass.internal.tree.controldirective.TemporaryNode.traverse(TemporaryNode.java:71)
        at com.vaadin.sass.internal.visitor.MixinNodeHandler.replaceMixinNode(MixinNodeHandler.java:75)
        at com.vaadin.sass.internal.visitor.MixinNodeHandler.replaceMixins(MixinNodeHandler.java:46)
        at com.vaadin.sass.internal.visitor.MixinNodeHandler.traverse(MixinNodeHandler.java:35)
        at com.vaadin.sass.internal.tree.MixinNode.traverse(MixinNode.java:116)
        at com.vaadin.sass.internal.visitor.BlockNodeHandler.traverse(BlockNodeHandler.java:69)
        at com.vaadin.sass.internal.tree.BlockNode.traverse(BlockNode.java:120)
        at com.vaadin.sass.internal.tree.Node.traverseChildren(Node.java:227)
        at com.vaadin.sass.internal.tree.Node.traverseChildren(Node.java:214)
        at com.vaadin.sass.internal.ScssStylesheet.traverse(ScssStylesheet.java:298)
        at com.vaadin.sass.internal.ScssStylesheet.compile(ScssStylesheet.java:267)
        at CubaWebScssThemeCreation.compileScss(CubaWebScssThemeCreation.groovy:453)
        at CubaWebScssThemeCreation$compileScss$4.callCurrent(Unknown Source)
        at CubaWebScssThemeCreation.buildTheme(CubaWebScssThemeCreation.groovy:343)
        at CubaWebScssThemeCreation$buildTheme$2.callCurrent(Unknown Source)
        at CubaWebScssThemeCreation.buildThemes(CubaWebScssThemeCreation.groovy:206)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:73)
        at org.gradle.api.internal.project.taskfactory.StandardTaskAction.doExecute(StandardTaskAction.java:46)
        at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:39)
        at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:26)
        at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:784)
        at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:751)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$1.run(ExecuteActionsTaskExecuter.java:121)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:110)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:92)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:70)
        at org.gradle.api.internal.tasks.execution.OutputDirectoryCreatingTaskExecuter.execute(OutputDirectoryCreatingTaskExecuter.java:51)
        at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:62)
        at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:54)
        at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:60)
        at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:97)
        at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:87)
        at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.java:52)
        at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
        at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:54)
        at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
        at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:34)
        at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker$1.run(DefaultTaskGraphExecuter.java:248)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110)
        at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:241)
        at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:230)
        at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.processTask(DefaultTaskPlanExecutor.java:123)
        at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.access$200(DefaultTaskPlanExecutor.java:79)
        at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:104)
        at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:98)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.execute(DefaultTaskExecutionPlan.java:626)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.executeWithTask(DefaultTaskExecutionPlan.java:581)
        at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.run(DefaultTaskPlanExecutor.java:98)
        at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
        at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
        at java.lang.Thread.run(Thread.java:748)

I found the issue in our halo-ext.scss by looking for the reported arguments.

.v-loading-indicator-wait { width: 96%; .v-ff & { width: 90%; } @include animation(v-progress-wait 5s forwards, v-progress-wait 4s infinite backwards); }