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community.blynk.cc/t/how-to-fix-compiler-problem-error-please-specify-your...Private View You’ll see that this includes a value called BLYNK_AUTH_TOKEN. Many old sketches used a variable called “auth” to store the Auth token and the most efficient way to convert an old sketch into the new format is to delete everything that relates to theirs Auth variable use BLYNK_AUTH_TOKEN directly in your Blynk.begin() or Blynk.config() statement, like this….