Installing testlink1.9.x version, database connection problem

The test side requires testlink, install install, and found that the testlink database keeps reporting errors
Another web ZenTao deployed in the same environment runs very normally, and the database connection is also normal. There is no problem. Can you help me find out? Situation

<code># 部署环境
PHP 7.0.5
mysql 5.6.30
nginx/1.9.14</code>

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The test side requires testlink, install install, and found that the testlink database keeps reporting errors
Another web ZenTao deployed in the same environment runs very normally, and the database connection is also normal. There is no problem. Can you help me find out? Situation

<code># 部署环境
PHP 7.0.5
mysql 5.6.30
nginx/1.9.14</code>