Add Watermark is not working in AEM 6.4

Hi Experts,

We are applying the watermarking as per below Link:

Watermarking

But getting the below error:

com.adobe.granite.workflow.WorkflowException: Process execution resulted in an error

at com.adobe.granite.workflow.core.job.HandlerBase.executeProcess(HandlerBase.java:204)

at com.adobe.granite.workflow.core.job.JobHandler.process(JobHandler.java:261)

at org.apache.sling.event.impl.jobs.JobConsumerManager$JobConsumerWrapper.process(JobConsumerManager.java:502)

at org.apache.sling.event.impl.jobs.queues.JobQueueImpl.startJob(JobQueueImpl.java:293)

at org.apache.sling.event.impl.jobs.queues.JobQueueImpl.access$100(JobQueueImpl.java:60)

at org.apache.sling.event.impl.jobs.queues.JobQueueImpl$1.run(JobQueueImpl.java:229)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

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

Caused by: com.adobe.granite.workflow.WorkflowException: Failed to execute process

at com.day.cq.workflow.compatibility.CQWorkflowProcessRunner.execute(CQWorkflowProcessRunner.java:108)

at com.adobe.granite.workflow.core.job.HandlerBase.executeProcess(HandlerBase.java:194)

... 8 more

Caused by: com.day.cq.workflow.WorkflowException: com.day.cq.dam.commons.watermark.WatermarkingException: Unable to create layer from asset image

at com.day.cq.dam.core.process.WaterMarkProcess.execute(WaterMarkProcess.java:162)

at com.day.cq.workflow.compatibility.CQWorkflowProcessRunner.execute(CQWorkflowProcessRunner.java:93)

... 9 more

Caused by: com.day.cq.dam.commons.watermark.WatermarkingException: Unable to create layer from asset image

at com.day.cq.dam.core.process.WaterMarkProcess.execute(WaterMarkProcess.java:142)

... 10 more

Can you help us and guide us like what may be the cause.

Thanks

Samer