A PHP Error was encountered

Severity: Notice

Message: Undefined index: category_id

Filename: controllers/technical.php

Line Number: 86

A PHP Error was encountered

Severity: Notice

Message: Undefined index: category_id

Filename: controllers/technical.php

Line Number: 87

Fatal error: Call to a member function num_rows() on boolean in /mnt/qiyezhan/wanlishennong/application/client/models/technical_model.php on line 147