LoadRunner Error: Data at the root level is invalid

The following error is received when an attempt for a manual correlation of a value is made:

Error: Data at the root level is invalid. Line 1, position 1

The issue is caused by some snapshots containing an invalid XML code. This causes an exception and fails the correlation process.

The issue is fixed in VuGen 12.50. For VuGen 12.02, use the following fix:

  1. Download the attached CorrelationBackEnd.dll
  2. Backup the CorrelationBackEnd.dll in <vugen_installation_folder>\bin directory
  3. Replace with the downloaded one