An error occurred while verifying stamp: pdftk failed with command /usr/bin/pdftk tmp/vba_21_4142-stamped.pdf multistamp tmp/60f17dc6239bc5e80a5b5c9177451e66 output tmp/431b6071d733306e8e3020282c3344b2.pdf command output was: Unhandled Java Exception in create_output(): ExceptionConverter: java.io.FileNotFoundException: tmp/vba_21_4142-stamped.pdf (No such file or directory)  at java.base/java.io.RandomAccessFile.open0(Native Method)  at java.base/java.io.RandomAccessFile.open(RandomAccessFile.java:345)  at java.base/java.io.RandomAccessFile.<init>(RandomAccessFile.java:259)  at java.base/java.io.RandomAccessFile.<init>(RandomAccessFile.java:214)  at java.base/java.io.RandomAccessFile.<init>(RandomAccessFile.java:127)  at pdftk.com.lowagie.text.pdf.RandomAccessFileOrArray.reOpen(RandomAccessFileOrArray.java:329)  at pdftk.com.lowagie.text.pdf.PdfStamperImp.close(PdfStamperImp.java:192)  at pdftk.com.lowagie.text.pdf.PdfStamperImp.close(PdfStamperImp.java:304)  at com.gitlab.pdftk_java.filter.create_output_filter(filter.java:424)  at com.gitlab.pdftk_java.TK_Session.create_output(TK_Session.java:1445)  at com.gitlab.pdftk_java.pdftk.main_noexit(pdftk.java:192)  at com.gitlab.pdftk_java.pdftk.main(pdftk.java:163) There was a problem with pdftk-java. Please report it at https://gitlab.com/pdftk-java/pdftk/issues including the message above, the version of pdftk-java (3.2.2), and if possible steps to reproduce the error.
\e[1mFailure/Error: \e[0mfiller.generate

StandardError:
  An error occurred while verifying stamp: pdftk failed with command
  /usr/bin/pdftk tmp/vba_21_4142-stamped.pdf multistamp tmp/60f17dc6239bc5e80a5b5c9177451e66 output tmp/431b6071d733306e8e3020282c3344b2.pdf
  command output was:
  Unhandled Java Exception in create_output():
  ExceptionConverter: java.io.FileNotFoundException: tmp/vba_21_4142-stamped.pdf (No such file or directory)
  	at java.base/java.io.RandomAccessFile.open0(Native Method)
  	at java.base/java.io.RandomAccessFile.open(RandomAccessFile.java:345)
  	at java.base/java.io.RandomAccessFile.<init>(RandomAccessFile.java:259)
  	at java.base/java.io.RandomAccessFile.<init>(RandomAccessFile.java:214)
  	at java.base/java.io.RandomAccessFile.<init>(RandomAccessFile.java:127)
  	at pdftk.com.lowagie.text.pdf.RandomAccessFileOrArray.reOpen(RandomAccessFileOrArray.java:329)
  	at pdftk.com.lowagie.text.pdf.PdfStamperImp.close(PdfStamperImp.java:192)
  	at pdftk.com.lowagie.text.pdf.PdfStamperImp.close(PdfStamperImp.java:304)
  	at com.gitlab.pdftk_java.filter.create_output_filter(filter.java:424)
  	at com.gitlab.pdftk_java.TK_Session.create_output(TK_Session.java:1445)
  	at com.gitlab.pdftk_java.pdftk.main_noexit(pdftk.java:192)
  	at com.gitlab.pdftk_java.pdftk.main(pdftk.java:163)
  There was a problem with pdftk-java. Please report it at
  https://gitlab.com/pdftk-java/pdftk/issues
  including the message above, the version of pdftk-java (3.2.2), and if possible steps to reproduce the error.
./modules/simple_forms_api/app/services/simple_forms_api/pdf_stamper.rb:244:in `rescue in verify'
./modules/simple_forms_api/app/services/simple_forms_api/pdf_stamper.rb:237:in `verify'
./modules/simple_forms_api/app/services/simple_forms_api/pdf_stamper.rb:250:in `verified_multistamp'
./modules/simple_forms_api/app/services/simple_forms_api/pdf_stamper.rb:233:in `stamp_submission_date'
./modules/simple_forms_api/app/services/simple_forms_api/pdf_stamper.rb:31:in `stamp_pdf'
./modules/simple_forms_api/app/services/simple_forms_api/pdf_filler.rb:23:in `generate'
./modules/simple_forms_api/spec/services/pdf_filler_spec.rb:20:in `block (2 levels) in test_pdf_fill'
/usr/local/bundle/gems/webmock-3.23.0/lib/webmock/rspec.rb:39:in `block (2 levels) in <top (required)>'
/usr/local/bundle/gems/rspec-retry-0.6.2/lib/rspec/retry.rb:124:in `block in run'
/usr/local/bundle/gems/rspec-retry-0.6.2/lib/rspec/retry.rb:110:in `loop'
/usr/local/bundle/gems/rspec-retry-0.6.2/lib/rspec/retry.rb:110:in `run'
/usr/local/bundle/gems/rspec-retry-0.6.2/lib/rspec_ext/rspec_ext.rb:12:in `run_with_retry'
/usr/local/bundle/gems/rspec-retry-0.6.2/lib/rspec/retry.rb:37:in `block (2 levels) in setup'
------------------
--- Caused by: ---
PdfForms::PdftkError:
  pdftk failed with command
  /usr/bin/pdftk tmp/vba_21_4142-stamped.pdf multistamp tmp/60f17dc6239bc5e80a5b5c9177451e66 output tmp/431b6071d733306e8e3020282c3344b2.pdf
  command output was:
  Unhandled Java Exception in create_output():
  ExceptionConverter: java.io.FileNotFoundException: tmp/vba_21_4142-stamped.pdf (No such file or directory)
  	at java.base/java.io.RandomAccessFile.open0(Native Method)
  	at java.base/java.io.RandomAccessFile.open(RandomAccessFile.java:345)
  	at java.base/java.io.RandomAccessFile.<init>(RandomAccessFile.java:259)
  	at java.base/java.io.RandomAccessFile.<init>(RandomAccessFile.java:214)
  	at java.base/java.io.RandomAccessFile.<init>(RandomAccessFile.java:127)
  	at pdftk.com.lowagie.text.pdf.RandomAccessFileOrArray.reOpen(RandomAccessFileOrArray.java:329)
  	at pdftk.com.lowagie.text.pdf.PdfStamperImp.close(PdfStamperImp.java:192)
  	at pdftk.com.lowagie.text.pdf.PdfStamperImp.close(PdfStamperImp.java:304)
  	at com.gitlab.pdftk_java.filter.create_output_filter(filter.java:424)
  	at com.gitlab.pdftk_java.TK_Session.create_output(TK_Session.java:1445)
  	at com.gitlab.pdftk_java.pdftk.main_noexit(pdftk.java:192)
  	at com.gitlab.pdftk_java.pdftk.main(pdftk.java:163)
  There was a problem with pdftk-java. Please report it at
  https://gitlab.com/pdftk-java/pdftk/issues
  including the message above, the version of pdftk-java (3.2.2), and if possible steps to reproduce the error.
  /usr/local/bundle/gems/pdf-forms-1.5.0/lib/pdf_forms/pdftk_wrapper.rb:98:in `call_pdftk'