r - Error when extracting pdf data using tabulizer

Question

When I want to extract tables from multiple PDF files with the extract_tables() function from the tabulizer library I get the following error :

extract_tables(files)
**Error in .jcall("RJavaTools", "Ljava/lang/Object;", "newInstance", class,  : 
  java.lang.NoSuchMethodException: No constructor matching the given parameters
In addition: Warning message:
In if (grepl("^http.*://", path)) { :
  the condition has length > 1 and only the first element will be used**

When I use the function for one PDF file it works fine, but when I use several it goes wrong.

Does anyone know what error message this is and how I can fix it?