Evaluating PDF Assembler and getting the following errors - Help needed

I am having following three issues when merging document using PDF Assembler Service:-

Error # 1 (JobID: 20369)

1. System.ServiceModel.FaultException: Caused by: com.adobe.livecycle.assembler.client.ProcessingException: ALC-ASM-S00-002: Failed to execute the DDX - error messages provided. Caused by: com.adobe.internal.pdfm.assembly.AssemblyException: PDFM_S02013: The "insertDocument" operation failed on "137.pdf".; nested exception is:

com.adobe.livecycle.assembler.client.ProcessingException: ALC-ASM-S00-002: Failed to execute the DDX - error messages provided.

Error # 2 (JobID: 19966)

1. System.ServiceModel.FaultException: Caused by: com.adobe.livecycle.assembler.client.ProcessingException: ALC-ASM-S00-002: Failed to execute the DDX - error messages provided. Caused by: com.adobe.internal.pdfm.assembly.AssemblyException: PDFM_S02013: The "insertDocument" operation failed on "1033.pdf".; nested exception is:

com.adobe.livecycle.assembler.client.ProcessingException: ALC-ASM-S00-002: Failed to execute the DDX - error messages provided.

Error # 3 (JobID: 19419)

The request channel timed out while waiting for a reply after 00:09:59.9920000. Increase the timeout value passed to the call to Request or increase the SendTimeout value on the Binding. The time allotted to this operation may have been a portion of a longer timeout.