HeBo font not found exception even though it's present in the system

Throws an IO Exception without falling back to other fonts. However, Helvetica-Bold is available IF HeBo means Helvetica-Bold. See .pdfbox.cache file.

 - Exception : ----Could not find font: /HeBo
java.io.IOException: Could not find font: /HeBo
        at org.apache.pdfbox.pdmodel.interactive.form.PDDefaultAppearanceString.processSetFont(PDDefaultAppearanceString.java:179)
        at org.apache.pdfbox.pdmodel.interactive.form.PDDefaultAppearanceString.processOperator(PDDefaultAppearanceString.java:132)
        at org.apache.pdfbox.pdmodel.interactive.form.PDDefaultAppearanceString.processAppearanceStringOperators(PDDefaultAppearanceString.java:108)

.pdfbox.cache