Gradle error while running nativecsript angular app in android

Could not compile script ‘D:\signature-project1\node_modules\nativescript-signaturepad\platforms\android\include.gradle’.

startup failed:
script ‘D:\signature-project1\node_modules\nativescript-signaturepad\platforms\android\include.gradle’: 1: Invalid variable name. Must start with a letter but was: ?
. At [1:1] @ line 1, column 1.
?//default elements
^