Error in creating Mosaic using nem-sdk (javascript)

[johnmackyllego]

Error message:
{ code: 0, data: { timeStamp: 114514807, error: 'Internal Server Error', message: 'org.nem.core.serialization.SerializationException: java.lang.IllegalArgumentException: name does not match the desired pattern', status: 500 } }

our source code:
`
createMosaic : function(){
var privateKey = '7bfb69ab63df2a7ab4c690b206ddc4538dfae07e5cde4919dbe4ff385c6aff2a';
//var namespaceId = 'Brgy';
var mosaicName ='MoneyGram';
var initialSupply = 1000;
var divisibility = 2;
var transferable = true;
var supplyMutable = true;
var common = nem.model.objects.create('common')('', privateKey);

    // Get a MosaicDefinitionCreationTransaction object
    var tx = nem.model.objects.get("mosaicDefinitionTransaction");
    // Define the mosaic
    tx.mosaicName = mosaicName;
    tx.namespaceParent = {
        "fqn": "nanomoto"
    };
    tx.mosaicDescription = 'My mosaic';

    // Set properties (see https://nemproject.github.io/#mosaicProperties)
    tx.properties.initialSupply = initialSupply;
    tx.properties.divisibility = divisibility;
    tx.properties.transferable = transferable;
    tx.properties.supplyMutable = supplyMutable;
    tx.levy = {};
    //console.log(tx);
    
    // Prepare the transaction object
    var transactionEntity = nem.model.transactions.prepare("mosaicDefinitionTransaction")(common, tx, nem.model.network.data.testnet.id);
    console.log(transactionEntity);
    nem.model.transactions.send(common, transactionEntity, endpoint).then(function(res){
        console.log(res);
    },
        function(err){
        console.log(err);
    });

},`

We follow the instruction here:
https://github.com/QuantumMechanics/NEM-sdk/blob/master/examples/nodejs/createMosaic.js#L19

[riyazlafir]

@johnmackyllego please try mosaic name with lower case letters.
instead of this
tx.mosaicName = mosaicName;

try,
tx.mosaicName = mosaicname;

This solved the same issue which I had.

Cheers.