What is the solution to the error prompted by the interface after building the Lepus monitoring system?

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After building the Lepus monitoring system, the interface indicates an error:

A PHP Error was encountered

Severity: Notice

Message: Only variable references should be returned by reference

Filename: core/Common.php

Line Number: 257

[root@b77-11-100 lepus_v3.7] # find /-name Common.php

/ opt/lampp/htdocs/system/core/Common.php

Modify the following

Return $_ config [0] = & $config

For

$_ config [0] = & $config

Return $_ config [0]

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