Unable to pass key as argument to remote script execution

// mode=local,language=javascript,parameters=[k,v]
cache.put(k, v)
cache.get(k)

scriptArgs.Add("k", MarshallValue("mykey"));
scriptArgs.Add("v", MarshallValue("myvalue"));
byte[] v = testCache.Execute(scriptName, scriptArgs);
...
private string MarshallValue(string v)
{
     byte[] bv = marshaller.ObjectToByteBuffer(v);
     return System.Text.Encoding.UTF8.GetString(bv);
}

.19:16:05,583 ERROR [org.infinispan.server.hotrod.CacheDecodeContext] (HotRod-ServerWorker-3-2) ISPN005003: Exception reported: org.infinispan.server.hotrod.InvalidMagicIdException: Error reading magic byte or message id: 1
4:      at org.infinispan.server.hotrod.HotRodDecoder.readHeader(HotRodDecoder.java:202)
4:      at org.infinispan.server.hotrod.HotRodDecoder.decodeHeader(HotRodDecoder.java:151)
4:      at org.infinispan.server.hotrod.HotRodDecoder.decode(HotRodDecoder.java:93)
4:      at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:411)
4:      at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:248)
4:      at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
4:      at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
4:      at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
4:      at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
4:      at org.infinispan.server.core.transport.StatsChannelHandler.channelRead(StatsChannelHandler.java:26)
4:      at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
4:      at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
4:      at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
4:      at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1334)
4:      at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
4:      at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
4:      at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:926)
4:      at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:134)
4:      at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:624)
4:      at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:559)
4:      at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:476)
4:      at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:438)
4:      at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
4:      at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144)
4:      at java.lang.Thread.run(Thread.java:745)

Infinispan.HotRod.Exceptions.HotRodClientException : org.infinispan.server.hotrod.InvalidMagicIdException: Error reading magic byte or message id: 1
4:    at Infinispan.HotRod.SWIGGen.RemoteByteArrayCache.execute(String name, StringMap args) in Y:\build_windows\swig\RemoteByteArrayCache.cs:line 304
4:    at Infinispan.HotRod.Impl.RemoteCacheSWIGGenImpl`2.Execute(String scriptName, IDictionary`2 dict) in Y:\src\main\cs\Infinispan\HotRod\Impl\RemoteCacheSWIGImpl.cs:line 257