"A tool with the ID SAMtools is absent" error on running variant calling workflow

Release candidate build version 33: Windows 64 bit (NSIS, full package)

Scenario:

1. Open the Workflow Designer.
2. Load "Call variants with SAMtools" sample workflow.
3. Set "Read Assembly (BAM/SAM)" to "_common_data/bam/scerevisiae.bam1.sam".
4. Set "Read Sequence" to "_common_data/genbank/pBR322.gb".
5. Add "Output variants file".
6. Run the workflow.
   Expected result: There are no errors.
   Current result: There is an unexpected error:

   (1) A tool with the ID SAMtools is absent
   

Affected tests:

• GUITest_regression_scenarios_test_1735
• GUITest_regression_scenarios_test_1738
• GUITest_regression_scenarios_test_2192
• GUITest_regression_scenarios_test_2266_1
• GUITest_regression_scenarios_test_5012
  XML tests:
• filter_bam/test_0001.xml- ..filter_bam/test_0006.xml
• rmdup_bam/test_0001.xml -.. rmdup_bam/test_0003.xml
• workflow_samples/raw_ngs/test_0003.xml -.. workflow_samples/raw_ngs/test_0006.xml