在阿里云OpenAPI我下载下来完整工程后，运行报错，怎么解决？
OpenAPI：DescribeMetricList链接：https://api.aliyun.com/api/Cms/2019-01-01/DescribeMetricList?spm=a2c4g.11186623.0.0.2eb567baDWwzL5&tab=DEMO&lang=GO¶ms={%22Namespace%22:%22acs_ecs_dashboard%22,%22MetricName%22:%22cpu_idle%22,%22Period%22:%2260%0A%22,%22StartTime%22:%222019-01-30%2000%3A00%3A00%0A%22,%22EndTime%22:%222019-01-30%2000%3A10%3A00%0A%22,%22Dimensions%22:%22%5B%7B%5C%22instanceId%5C%22%3A%5C%22i-2ze2d6j5uhg20x47****%5C%22%7D%5D%0A%22,%22Express%22:%22%7B%5C%22groupby%5C%22%3A%5B%5C%22userId%5C%22%2C%5C%22instanceId%5C%22%5D%7D%0A%22,%22NextToken%22:%2215761485350009dd70bb64cff1f0fff750b08ffff073be5fb1e785e2b020f1a949d5ea14aea7fed82f01dd8****%0A%22,%22Length%22:%221000%22}&useCommon=false报错信息：runtime error: invalid memory address or nil pointer dereference 
在阿里云OpenAPI我下载下来完整工程后，运行报错，怎么解决？
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