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Error : Error: Using $this when not in object context

Backtrace:
/home/themesxo/xoops_data/caches/smarty_compile/449155e6_left_column_solid_silver_flex_default^c52e7564df9bbfd93241e8fb23868a72888cb605_0.file.theme.html.php (69)
/class/libraries/vendor/smarty/smarty/libs/sysplugins/smarty_template_resource_base.php (123)
/class/libraries/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php (114)
/class/libraries/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php (216)
/class/libraries/vendor/smarty/smarty/libs/sysplugins/smarty_internal_templatebase.php (232)
/class/libraries/vendor/smarty/smarty/libs/sysplugins/smarty_internal_templatebase.php (134)
/class/theme.php (561)
/footer.php (51)
/modules/left-column/index.php (28)
/index.php (80)

Errors
Notice: Undefined index: xoops_js in file /home/themesxo/xoops_data/caches/smarty_compile/449155e6_left_column_solid_silver_flex_default^c52e7564df9bbfd93241e8fb23868a72888cb605_0.file.theme.html.php line 61
Notice: Trying to get property 'value' of non-object in file /home/themesxo/xoops_data/caches/smarty_compile/449155e6_left_column_solid_silver_flex_default^c52e7564df9bbfd93241e8fb23868a72888cb605_0.file.theme.html.php line 61
Error: Error: Using $this when not in object context in file /themes/solid_silver_flex/ex_assign.php line 18

Deprecated

Queries
0.000063 - SET SQL_BIG_SELECTS = 1
0.000813 - SELECT * FROM config WHERE (`conf_modid` = '0' AND `conf_catid` = '1') ORDER BY conf_order ASC
0.000169 - SELECT sess_data, sess_ip FROM session WHERE sess_id = '49784212727ec0a2a386784de361b9c5'
0.000179 - DELETE FROM protector_access WHERE expire < UNIX_TIMESTAMP()
0.000194 - SELECT COUNT(*) FROM protector_access WHERE ip='216.73.216.171' AND request_uri='/index.php?xoops_theme_select=solid_silver_flex'
0.000162 - SELECT COUNT(*) FROM protector_access WHERE ip='216.73.216.171'
0.000219 - INSERT INTO protector_access SET ip='216.73.216.171', request_uri='/index.php?xoops_theme_select=solid_silver_flex', expire=UNIX_TIMESTAMP()+'60'
0.000333 - SELECT COUNT(*) FROM group_permission WHERE (`gperm_modid` = '1' AND (`gperm_groupid` = '2') AND `gperm_name` = 'module_read' AND `gperm_itemid` = '5')
0.000290 - SELECT * FROM config WHERE (`conf_modid` = '0' AND `conf_catid` = '5') ORDER BY conf_order ASC
0.000117 - SELECT COUNT(*) FROM banner
0.000144 - SELECT * FROM banner LIMIT 2, 1
0.000160 - UPDATE banner SET impmade = 1278569 WHERE bid = 3
0.000282 - SELECT * FROM config WHERE (`conf_modid` = '0' AND `conf_catid` = '3') ORDER BY conf_order ASC
0.000509 - SELECT DISTINCT gperm_itemid FROM group_permission WHERE gperm_name = 'block_read' AND gperm_modid = 1 AND gperm_groupid IN (2)
0.001057 - SELECT b.* FROM newblocks b, block_module_link m WHERE m.block_id=b.bid AND b.isactive=1 AND b.visible=1 AND m.module_id IN (0,5) AND b.bid IN (1,2,3,4,5,6,7,8,9,10,11,12,14,15,16,17,18,19,20,21,23,24,13,22,25,26,27) ORDER BY b.weight, m.block_id
0.000201 - SELECT * FROM smiles
0.000530 - SELECT f.*, s.tpl_source FROM tplfile f LEFT JOIN tplsource s ON s.tpl_id=f.tpl_id WHERE (`tpl_tplset` = 'default' AND `tpl_file` = 'system_block_dummy.tpl') ORDER BY tpl_refid
0.000737 - SELECT f.*, s.tpl_source FROM tplfile f LEFT JOIN tplsource s ON s.tpl_id=f.tpl_id WHERE (`tpl_tplset` = 'default' AND `tpl_file` = 'system_block_themes.tpl') ORDER BY tpl_refid
0.000523 - SELECT f.*, s.tpl_source FROM tplfile f LEFT JOIN tplsource s ON s.tpl_id=f.tpl_id WHERE (`tpl_tplset` = 'default' AND `tpl_file` = 'system_dummy.tpl') ORDER BY tpl_refid
0.000346 - SELECT * FROM modules WHERE (`hasmain` = '1' AND `isactive` = '1' AND `weight` > '0') ORDER BY weight ASC, mid ASC
0.000373 - SELECT * FROM group_permission WHERE (`gperm_name` = 'module_read' AND `gperm_modid` = '1' AND `gperm_groupid` = '2')
Total: 21

Blocks
User Menu: Not cached
Custom Block (Auto Format + smilies): Not cached
Custom Block (Auto Format + smilies): Not cached
Custom Block (Auto Format + smilies): Not cached
Themes: Not cached
Custom Block (Auto Format + smilies): Not cached
Custom Block (Auto Format + smilies): Not cached
Custom Block (Auto Format + smilies): Not cached
Custom Block (HTML): Not cached
Custom Block (HTML): Not cached
Custom Block (HTML): Not cached
Total: 11

Extra
Included files: 165 files
Memory usage: 6447264 bytes

Timers
XOOPS took 0.093 seconds to load.
XOOPS Boot took 0.012 seconds to load.
Module init took 0.006 seconds to load.
XOOPS output init took 0.043 seconds to load.
Module display took 0.000 seconds to load.
Page rendering took 0.032 seconds to load.