About XSLT Error XPath expression failed to execute (FOTY0001: type error)

Some times we face below error in real-time.
We can’t find this error in compilation time we can see this only in execution time
in console.To resolve this we need to open the code in JDeveloper click on Transformation
wait up to source part and target part to open then test the XSLT close
and save the project and redeploy the code.