Getting a "Please enter an amount greater than zero" on all submissions

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I am suddenly getting a error on all of the links on my site where it says "Please enter an amount greater than zero." Although the default quantity is set to 1. This worked previously but doesn't now. Any ideas?

Type: Pre-Sale
Status: New
Planet4
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concrete5 Environment Information

# concrete5 Version
5.6.2.1

# concrete5 Packages
Nancy Irenes Naturals (3.5.3), Paypal Cart System (1.0), tnSpacer (1.3).

# concrete5 Overrides
None

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Apache

# Server API
cgi-fcgi

# PHP Version
5.3.24

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# PHP Settings
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apc.max_file_size - 1M
log_errors_max_len - 1024
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max_input_time - 60
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memory_limit - 64M
post_max_size - 10M
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sql.safe_mode - Off
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mysql.max_links - Unlimited
mysql.max_persistent - Unlimited
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
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session.cache_limiter - nocache
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5
safe_mode_allowed_env_vars - PHP_
safe_mode_protected_env_vars - LD_LIBRARY_PATH

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