Mod not upgrading from 1.15 to 1.16

Hi, when I was trying to update my mod, Mcreator gave an error and I can no longer use the worksplace. Luckily, I made a backup before, so I still have the 1.15 version safe. Can you tell me why do I have an error while upgrading my mod? Thanks.

I paste here the error I got from MCreator:

Executing 
    Gradle task: build

Build 
    info: MCreator 2021.1.18117, forge-1.16.5, 64-bit, 16201 MB, Windows 10, 
    JVM 1.8.0_275, JAVA_HOME: C:\Program Files\Pylo\MCreator\jdk

org.gradle.tooling.GradleConnectionException: 
    Could not execute build using connection to Gradle distribution 
    'https://services.gradle.org/distributions/gradle-6.8.1-all.zip'.

 
      at org.gradle.tooling.internal.consumer.ExceptionTransformer.transform(
ExceptionTransformer.java:55
)

 
      at org.gradle.tooling.internal.consumer.ExceptionTransformer.transform(
ExceptionTransformer.java:29
)

 
      at org.gradle.tooling.internal.consumer.ResultHandlerAdapter.onFailure(
ResultHandlerAdapter.java:43
)

 
      at 
    org.gradle.tooling.internal.consumer.async.DefaultAsyncConsumerActionExecutor$1$1.run(
DefaultAsyncConsumerActionExecutor.java:69
)

 
      at 
    org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(
ExecutorPolicy.java:64
)

 
      at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(
ManagedExecutorImpl.java:48
)

 
      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:56
)

 
      at java.lang.Thread.run(
Thread.java:748
)

Caused 
    by: org.gradle.launcher.daemon.client.DaemonConnectionException: Could not 
    receive a message from the daemon.

 
      at org.gradle.launcher.daemon.client.DaemonClientConnection.receive(
DaemonClientConnection.java:83
)

 
      at org.gradle.launcher.daemon.client.DaemonClient.executeBuild(
DaemonClient.java:167
)

 
      at org.gradle.launcher.daemon.client.DaemonClient.execute(
DaemonClient.java:147
)

 
      at org.gradle.launcher.daemon.client.DaemonClient.execute(
DaemonClient.java:98
)

 
      at 
    org.gradle.tooling.internal.provider.DaemonBuildActionExecuter.execute(
DaemonBuildActionExecuter.java:46
)

 
      at 
    org.gradle.tooling.internal.provider.DaemonBuildActionExecuter.execute(
DaemonBuildActionExecuter.java:31
)

 
      at 
    org.gradle.tooling.internal.provider.LoggingBridgingBuildActionExecuter.execute(
LoggingBridgingBuildActionExecuter.java:60
)

 
      at 
    org.gradle.tooling.internal.provider.LoggingBridgingBuildActionExecuter.execute(
LoggingBridgingBuildActionExecuter.java:37
)

 
      at org.gradle.tooling.internal.provider.ProviderConnection.run(
ProviderConnection.java:218
)

 
      at org.gradle.tooling.internal.provider.ProviderConnection.run(
ProviderConnection.java:144
)

 
      at org.gradle.tooling.internal.provider.DefaultConnection.getModel(
DefaultConnection.java:202
)

 
      at 
    org.gradle.tooling.internal.consumer.connection.CancellableModelBuilderBackedModelProducer.produceModel(
CancellableModelBuilderBackedModelProducer.java:54
)

 
      at 
    org.gradle.tooling.internal.consumer.connection.PluginClasspathInjectionSupportedCheckModelProducer.produceModel(
PluginClasspathInjectionSupportedCheckModelProducer.java:38
)

 
      at 
    org.gradle.tooling.internal.consumer.connection.AbstractConsumerConnection.run(
AbstractConsumerConnection.java:64
)

 
      at 
    org.gradle.tooling.internal.consumer.connection.ParameterValidatingConsumerConnection.run(
ParameterValidatingConsumerConnection.java:49
)

 
      at org.gradle.tooling.internal.consumer.DefaultBuildLauncher$1.run(
DefaultBuildLauncher.java:97
)

 
      at org.gradle.tooling.internal.consumer.DefaultBuildLauncher$1.run(
DefaultBuildLauncher.java:89
)

 
      at 
    org.gradle.tooling.internal.consumer.connection.LazyConsumerActionExecutor.run(
LazyConsumerActionExecutor.java:144
)

 
      at 
    org.gradle.tooling.internal.consumer.connection.CancellableConsumerActionExecutor.run(
CancellableConsumerActionExecutor.java:45
)

 
      at 
    org.gradle.tooling.internal.consumer.connection.ProgressLoggingConsumerActionExecutor.run(
ProgressLoggingConsumerActionExecutor.java:61
)

 
      at 
    org.gradle.tooling.internal.consumer.connection.RethrowingErrorsConsumerActionExecutor.run(
RethrowingErrorsConsumerActionExecutor.java:38
)

 
      at 
    org.gradle.tooling.internal.consumer.async.DefaultAsyncConsumerActionExecutor$1$1.run(
DefaultAsyncConsumerActionExecutor.java:67
)

 
      ... 6 more

Caused 
    by: org.gradle.internal.remote.internal.MessageIOException: Could not read 
    message from '/127.0.0.1:50848'.

 
      at org.gradle.internal.remote.internal.inet.SocketConnection.receive(
SocketConnection.java:94
)

 
      at org.gradle.launcher.daemon.client.DaemonClientConnection.receive(
DaemonClientConnection.java:77
)

 
      ... 27 more

Caused 
    by: com.esotericsoftware.kryo.KryoException: java.io.IOException: Se ha 
    anulado una conexión establecida por el software en su equipo host.

 
      at com.esotericsoftware.kryo.io.Input.fill(
Input.java:148
)

 
      at com.esotericsoftware.kryo.io.Input.require(
Input.java:178
)

 
      at com.esotericsoftware.kryo.io.Input.readVarInt(
Input.java:355
)

 
      at com.esotericsoftware.kryo.io.Input.readInt(
Input.java:350
)

 
      at org.gradle.internal.serialize.kryo.KryoBackedDecoder.readSmallInt(
KryoBackedDecoder.java:127
)

 
      at 
    org.gradle.internal.serialize.DefaultSerializerRegistry$TaggedTypeSerializer.read(
DefaultSerializerRegistry.java:142
)

 
      at 
    org.gradle.internal.serialize.Serializers$StatefulSerializerAdapter$1.read(
Serializers.java:36
)

 
      at org.gradle.internal.remote.internal.inet.SocketConnection.receive(
SocketConnection.java:81
)

 
      ... 28 more

Caused 
    by: java.io.IOException: Se ha anulado una conexión establecida por el 
    software en su equipo host.

 
      at sun.nio.ch.SocketDispatcher.read0(Native Method)

 
      at sun.nio.ch.SocketDispatcher.read(
SocketDispatcher.java:43
)

 
      at sun.nio.ch.IOUtil.readIntoNativeBuffer(
IOUtil.java:223
)

 
      at sun.nio.ch.IOUtil.read(
IOUtil.java:192
)

 
      at sun.nio.ch.SocketChannelImpl.read(
SocketChannelImpl.java:379
)

 
      at 
    org.gradle.internal.remote.internal.inet.SocketConnection$SocketInputStream.read(
SocketConnection.java:196
)

 
      at com.esotericsoftware.kryo.io.Input.fill(
Input.java:146
)

 
      ... 35 more

TASK 
    EXECUTION FAILED

Task 
    completed in 1 second