The data could not be converted - docusignapi

Question

I had a working function call the Docusign SOAP API and now all of the sudden its not working. I get the error "The data could not be converted" when I call the CreateEnvelopeFromTemplatesAndForms method. Here is my code.
Dim _userName As String = ""
Dim _apiUrl As String = "https://demo.docusign.net/api/3.0/api.asmx"
Dim _accountId As String = "d90f6802-fa06-42b4-ac3b-5959c3905002"
Dim _password As String = "WWWxyz123"
Dim _email As String = "JGarland#etgroup.net"
Dim _integratorKey As String = "ETGX-1f61c95b-06bd-400b-9604-f247fda0238c"
Sub Main()
'GetSignatureSpot(Nothing)
'GetPDF()
'GetCertificate()
'Exit Sub
_userName = "[" + _integratorKey + "]"
_userName = _userName & _email
Dim _apiClient As DocuSign.DSAPIServiceSoapClient = New DocuSign.DSAPIServiceSoapClient("DSAPIServiceSoap", _apiUrl)
_apiClient.ClientCredentials.UserName.UserName = _userName
_apiClient.ClientCredentials.UserName.Password = _password
Dim envelopeInfo As DocuSign.EnvelopeInformation = New DocuSign.EnvelopeInformation()
envelopeInfo.AccountId = _accountId
envelopeInfo.EmailBlurb = "Please Sign Your Loan Documents"
envelopeInfo.Subject = "Please Sign Your Loan Documents"
'Recipients
Dim recipient1 As DocuSign.Recipient = New DocuSign.Recipient()
recipient1.UserName = "John Doe"
recipient1.Email = "Support#etgroup.net"
recipient1.Type = DocuSign.RecipientTypeCode.Signer
recipient1.RoutingOrder = 1
recipient1.RoutingOrderSpecified = True
recipient1.RoleName = "Borrower 1"
recipient1.ID = "1"
Dim recipient2 As DocuSign.Recipient = New DocuSign.Recipient()
recipient2.UserName = "Jane Doe"
recipient2.Email = "JGarland#etgroup.net"
recipient2.Type = DocuSign.RecipientTypeCode.Signer
recipient2.RoutingOrder = 2
recipient2.RoutingOrderSpecified = True
recipient2.RoleName = "Borrower 2"
recipient2.ID = "2"
Dim signers(1) As DocuSign.Recipient
signers(0) = recipient1
signers(1) = recipient2
'Create draft with all the composite template information
Dim status As DocuSign.EnvelopeStatus
Dim compositTemplate(1) As DocuSign.CompositeTemplate
Dim template As DocuSign.CompositeTemplate
Dim template2 As DocuSign.CompositeTemplate
'Template 1
template = CreateTemplate(1, "Attorney Selection Notice", "F364E20C-D0E6-4735-89E2-8891424BA364", signers, "AttorneySelection.pdf")
compositTemplate(0) = template
'Template 2
template2 = CreateTemplate(2, "Notice of No Oral", "F5A536C3-81AB-4C32-B56A-9F764624C3C4", signers, "NoticeOral.pdf")
compositTemplate(1) = template2
status = _apiClient.CreateEnvelopeFromTemplatesAndForms(envelopeInfo, compositTemplate, True)
End Sub
Private Function CreateTemplate(sequence As Integer, templateName As String, templateID As String, signers() As DocuSign.Recipient, docPath As String) As DocuSign.CompositeTemplate
Dim template As DocuSign.CompositeTemplate = New DocuSign.CompositeTemplate()
'Server Template
Dim serverTemplate As DocuSign.ServerTemplate = New DocuSign.ServerTemplate()
serverTemplate.Sequence = sequence
serverTemplate.TemplateID = templateID
Dim serverTemplates(0) As DocuSign.ServerTemplate
serverTemplates(0) = serverTemplate
template.ServerTemplates = serverTemplates
'Inline Template
Dim inlineTemplate As DocuSign.InlineTemplate = New DocuSign.InlineTemplate()
inlineTemplate.Sequence = "1"
inlineTemplate.Envelope = New DocuSign.Envelope()
inlineTemplate.Envelope.Recipients = signers
inlineTemplate.Envelope.AccountId = _accountId
Dim inlineTemplates(0) As DocuSign.InlineTemplate
inlineTemplates(0) = inlineTemplate
template.InlineTemplates = inlineTemplates
'Document.
template.Document = New DocuSign.Document()
template.Document.ID = "1"
template.Document.Name = ""
template.Document.PDFBytes = System.IO.File.ReadAllBytes(path:=docPath)
template.Document.FileExtension = "pdf"
Return template
End Function

Answer 1

It looks like there were issues with the DocuSign Demo environment (server) recently, according to the DocuSign Trust Center. This is most likely what was causing your issues.
These issues are currently resolved and your envelopes should be working again now. For reference, this is the DocuSign Trust Center with monitoring on the DEMO environment:
https://trust.docusign.com/system-status/demo