ClientPlayerEntity cannot be cast to ServerPlayerEntity

[RoggyMan01]

I'm new to forge developing and I'm trying to make a custom tile entity for a mod, but when I right click the block, the game crashes. The error seems tobe here:
 

@Override
    public ActionResultType use(BlockState state, World worldIn, BlockPos pos,
                                PlayerEntity player, Hand handIn, BlockRayTraceResult hit) {
        if(worldIn.isClientSide()){
            TileEntity tileEntity = worldIn.getBlockEntity(pos);

            if(!player.isCrouching()){
                if(tileEntity instanceof BasicGemFusionBenchTile){
                    INamedContainerProvider containerProvider = createContainerProvider(worldIn,pos);

                    NetworkHooks.openGui(((ServerPlayerEntity)player), containerProvider, tileEntity.getBlockPos());
                }else {
                    throw new IllegalStateException("Our Container provider is missing");
                }
            }
        }



        return ActionResultType.SUCCESS;
    }

Could someone help me out?

[Luis_ST]

6 minutes ago, RoggyMan01 said:

if(worldIn.isClientSide()){

and then

6 minutes ago, RoggyMan01 said:

NetworkHooks.openGui(((ServerPlayerEntity)player), containerProvider, tileEntity.getBlockPos());

the error should be clear, also note you can't open a gui (Container) on the client

[RoggyMan01]

It works, thank you so much!

Edited January 29 by RoggyMan01