"throw_away_the_lime" task can not be executed

[AlexWanghaoming]

I found that the example task "throw_away_the_lime" can not be executed successfully in virtualhome v. 2.2.4. I just followed the provided example:

"throw_away_the_lime": "def throw_away_the_lime():\n\t# 0: walk to kitchen\n\twalk('kitchen')\n\t# 1: find garbage can\n\tfind('garbagecan')\n\t# 2: grab lime\n\tfind('lime')\n\tassert('close' to 'lime')\n\t\telse: find('lime')\n\tgrab('lime')\n\t# 3: put lime in garbage can\n\tfind('garbagecan')\n\tassert('close' to 'garbagecan' ) \n\t\telse: find('garbagecan')\n\tassert('garbagecan' is 'closed' )\n\t\telse: close('garbagecan')\n\topen('garbagecan')\n\tassert('lime' in 'hands' )\n\t\telse: find('lime')\n\t\telse: grab('lime')\n\tassert('close' to 'garbagecan' ) \n\t\telse: find('garbagecan')\n\tassert('garbagecan' is 'opened' )\n\t\telse: open('garbagecan')\n\tputin('lime', 'garbagecan')\n\tassert('close' to 'garbagecan' )\n\t\telse: find('garbagecan')\n\tassert('garbagecan' is 'opened' )\n\t\telse: open('garbagecan')\n\tclose('garbagecan')\n\t# 4: Done",

and got an error at step "find(lime)":

{'0': {'message': 'ScriptExcutor 0: PROCESS WALK: Can not select object: lime. REASON: No interaction positions\nEXECUTION_GENERAL: Script is impossible to execute\n\n'}}