The Correlation Studio in LR 11.5.X might take some time for finish the correlation scanning process. To improve the time it takes to respond quickly try the below mentioned points.
1. In the recording options disabled the response based correlation and async scan options. And try one more time. If the error persist continue with the next steps.
2. Use the attached DefaultComponentSuite.xml. Please replace the file that is located under <LR_Installation>\config\, and restart the VuGen, restart VuGen. That will be much faster, 20 seconds for scanning. Make a backup file of the original before any modification.
3. Disable record scan. The user can also turn off the record scan by unselecting it in the Recording Options dialog.