This error is from your Salesforce account, which means that your account is not API enabled. This usually happens to Professional Salesforce Edition.
Salesforce SyncApps only work with Developer, Professional, Enterprise, and Unlimited Editions. For Professional Edition, you may need to request API access from your Salesforce sales representative. *Lightning Developer, Lightning Professional, Lightning Enterprise, and Lightning Unlimited are supported.
You can also take a look at this article on how to enable API access in your Salesforce account.
SyncApps uses oAuth2 to connect to Salesforce.
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Check out these Help Desk articles for answers to frequently asked questions.